666404732 has 12 divisors (see below), whose sum is σ = 1332809520. Its totient is φ = 285602016.

The previous prime is 666404723. The next prime is 666404741. The reversal of 666404732 is 237404666.

It is an interprime number because it is at equal distance from previous prime (666404723) and next prime (666404741).

666404732 is an admirable number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11900057 + ... + 11900112.

It is an arithmetic number, because the mean of its divisors is an integer number (111067460).

Almost surely, 2^666404732 is an apocalyptic number.

It is an amenable number.

666404732 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

666404732 is a wasteful number, since it uses less digits than its factorization.

666404732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23800180 (or 23800178 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 666404732 is about 25814.8161333758. The cubic root of 666404732 is about 873.4660392451.

The spelling of 666404732 in words is "six hundred sixty-six million, four hundred four thousand, seven hundred thirty-two".