666432 has 84 divisors (see below), whose sum is σ = 2080260. Its totient is φ = 202752.

The previous prime is 666431. The next prime is 666433. The reversal of 666432 is 234666.

It is an interprime number because it is at equal distance from previous prime (666431) and next prime (666433).

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 553536 = 336^2 + 744^2 .

It is a super-2 number, since 2×666432² = 888263221248, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666396 and 666405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7444 + ... + 7532.

It is an arithmetic number, because the mean of its divisors is an integer number (24765).

2⁶⁶⁶⁴³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040130).

666432 is an abundant number, since it is smaller than the sum of its proper divisors (1413828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666432 is a wasteful number, since it uses less digits than its factorization.

666432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 107 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 666432 is about 816.3528648814. The cubic root of 666432 is about 87.3477952599.

The spelling of 666432 in words is "six hundred sixty-six thousand, four hundred thirty-two".