646666032 has 40 divisors (see below), whose sum is σ = 1675964160. Its totient is φ = 214857280.

The previous prime is 646665991. The next prime is 646666039. The reversal of 646666032 is 230666646.

It is not an unprimeable number, because it can be changed into a prime (646666039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6732 + ... + 36587.

It is an arithmetic number, because the mean of its divisors is an integer number (41899104).

Almost surely, 2^646666032 is an apocalyptic number.

It is an amenable number.

646666032 is an abundant number, since it is smaller than the sum of its proper divisors (1029298128).

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

646666032 is a wasteful number, since it uses less digits than its factorization.

646666032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43641 (or 43635 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 39.

The square root of 646666032 is about 25429.6290181355. The cubic root of 646666032 is about 864.7555333967.

The spelling of 646666032 in words is "six hundred forty-six million, six hundred sixty-six thousand, thirty-two".