642156608 has 28 divisors (see below), whose sum is σ = 1308724332. Its totient is φ = 312399360.

The previous prime is 642156607. The next prime is 642156611. The reversal of 642156608 is 806651246.

It can be written as a sum of positive squares in 2 ways, for example, as 554696704 + 87459904 = 23552^2 + 9352^2 .

It is not an unprimeable number, because it can be changed into a prime (642156601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133223 + ... + 137958.

Almost surely, 2^642156608 is an apocalyptic number.

It is an amenable number.

642156608 is an abundant number, since it is smaller than the sum of its proper divisors (666567724).

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

642156608 is a wasteful number, since it uses less digits than its factorization.

642156608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271230 (or 271220 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 642156608 is about 25340.8091425669. The cubic root of 642156608 is about 862.7407639272.

The spelling of 642156608 in words is "six hundred forty-two million, one hundred fifty-six thousand, six hundred eight".