642974004 has 24 divisors (see below), whose sum is σ = 1666969920. Its totient is φ = 214324632.

The previous prime is 642973987. The next prime is 642974011. The reversal of 642974004 is 400479246.

642974004 is a `hidden beast` number, since 642 + 9 + 7 + 4 + 0 + 0 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 642974004.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2976624 + ... + 2976839.

It is an arithmetic number, because the mean of its divisors is an integer number (69457080).

Almost surely, 2^642974004 is an apocalyptic number.

It is an amenable number.

642974004 is an abundant number, since it is smaller than the sum of its proper divisors (1023995916).

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

642974004 is a wasteful number, since it uses less digits than its factorization.

642974004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5953476 (or 5953468 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 642974004 is about 25356.9320699488. The cubic root of 642974004 is about 863.1066673207.

The spelling of 642974004 in words is "six hundred forty-two million, nine hundred seventy-four thousand, four".