642688004 has 12 divisors (see below), whose sum is σ = 1285376064. Its totient is φ = 275437704.

The previous prime is 642687971. The next prime is 642688051. The reversal of 642688004 is 400886246.

It is a happy number.

642688004 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11476544 + ... + 11476599.

It is an arithmetic number, because the mean of its divisors is an integer number (107114672).

Almost surely, 2^642688004 is an apocalyptic number.

It is an amenable number.

642688004 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.

642688004 is a wasteful number, since it uses less digits than its factorization.

642688004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22953154 (or 22953152 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 642688004 is about 25351.2919591882. The cubic root of 642688004 is about 862.9786760829.

The spelling of 642688004 in words is "six hundred forty-two million, six hundred eighty-eight thousand, four".