646564008 has 32 divisors (see below), whose sum is σ = 1643810400. Its totient is φ = 211867968.

The previous prime is 646563991. The next prime is 646564027. The reversal of 646564008 is 800465646.

It is a super-3 number, since 3×646564008³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226891 + ... + 229722.

It is an arithmetic number, because the mean of its divisors is an integer number (51369075).

Almost surely, 2^646564008 is an apocalyptic number.

It is an amenable number.

646564008 is an abundant number, since it is smaller than the sum of its proper divisors (997246392).

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

646564008 is a wasteful number, since it uses less digits than its factorization.

646564008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456681 (or 456677 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 646564008 is about 25427.6229325511. The cubic root of 646564008 is about 864.7100537342.

The spelling of 646564008 in words is "six hundred forty-six million, five hundred sixty-four thousand, eight".