642820608 has 60 divisors (see below), whose sum is σ = 1855237098. Its totient is φ = 214272000.

The previous prime is 642820571. The next prime is 642820613. The reversal of 642820608 is 806028246.

642820608 is a `hidden beast` number, since 6 + 4 + 28 + 20 + 608 = 666.

It can be written as a sum of positive squares in only one way, i.e., 408363264 + 234457344 = 20208^2 + 15312^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65143 + ... + 74358.

Almost surely, 2^642820608 is an apocalyptic number.

It is an amenable number.

642820608 is an abundant number, since it is smaller than the sum of its proper divisors (1212416490).

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

642820608 is a wasteful number, since it uses less digits than its factorization.

642820608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139525 (or 139506 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 642820608 is about 25353.9071545196. The cubic root of 642820608 is about 863.0380239854.

The spelling of 642820608 in words is "six hundred forty-two million, eight hundred twenty thousand, six hundred eight".