656406432 has 72 divisors (see below), whose sum is σ = 2036361600. Its totient is φ = 198910080.

The previous prime is 656406427. The next prime is 656406451. The reversal of 656406432 is 234604656.

656406432 is a `hidden beast` number, since 6 + 5 + 6 + 4 + 0 + 643 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100432 + ... + 106767.

It is an arithmetic number, because the mean of its divisors is an integer number (28282800).

Almost surely, 2^656406432 is an apocalyptic number.

It is an amenable number.

656406432 is an abundant number, since it is smaller than the sum of its proper divisors (1379955168).

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

656406432 is a wasteful number, since it uses less digits than its factorization.

656406432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207226 (or 207215 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 656406432 is about 25620.4299729727. The cubic root of 656406432 is about 869.0757048533.

The spelling of 656406432 in words is "six hundred fifty-six million, four hundred six thousand, four hundred thirty-two".