642888804 has 12 divisors (see below), whose sum is σ = 1500073904. Its totient is φ = 214296264.

The previous prime is 642888797. The next prime is 642888823. The reversal of 642888804 is 408888246.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26787022 + ... + 26787045.

Almost surely, 2^642888804 is an apocalyptic number.

It is an amenable number.

642888804 is an abundant number, since it is smaller than the sum of its proper divisors (857185100).

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

642888804 is a wasteful number, since it uses less digits than its factorization.

642888804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53574074 (or 53574072 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 48.

The square root of 642888804 is about 25355.2520003253. The cubic root of 642888804 is about 863.0685424323.

The spelling of 642888804 in words is "six hundred forty-two million, eight hundred eighty-eight thousand, eight hundred four".