642051604 has 12 divisors (see below), whose sum is σ = 1123803828. Its totient is φ = 320964800.

The previous prime is 642051587. The next prime is 642051617. The reversal of 642051604 is 406150246.

It can be written as a sum of positive squares in 2 ways, for example, as 597802500 + 44249104 = 24450^2 + 6652^2 .

It is a congruent number.

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, 15174 + ... + 38914.

It is an arithmetic number, because the mean of its divisors is an integer number (93650319).

Almost surely, 2^642051604 is an apocalyptic number.

It is an amenable number.

642051604 is a deficient number, since it is larger than the sum of its proper divisors (481752224).

642051604 is a wasteful number, since it uses less digits than its factorization.

642051604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30506 (or 30504 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 642051604 is about 25338.7372218901. The cubic root of 642051604 is about 862.6937368894.

The spelling of 642051604 in words is "six hundred forty-two million, fifty-one thousand, six hundred four".