642656232 has 24 divisors (see below), whose sum is σ = 1740527490. Its totient is φ = 214218720.

The previous prime is 642656227. The next prime is 642656249. The reversal of 642656232 is 232656246.

642656232 is a `hidden beast` number, since 6 + 4 + 26 + 5 + 623 + 2 = 666.

642656232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 634737636 + 7918596 = 25194^2 + 2814^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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, 4462819 + ... + 4462962.

Almost surely, 2^642656232 is an apocalyptic number.

It is an amenable number.

642656232 is an abundant number, since it is smaller than the sum of its proper divisors (1097871258).

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

642656232 is a wasteful number, since it uses less digits than its factorization.

642656232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8925793 (or 8925786 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 642656232 is about 25350.6653167131. The cubic root of 642656232 is about 862.9644550767.

The spelling of 642656232 in words is "six hundred forty-two million, six hundred fifty-six thousand, two hundred thirty-two".