642300656 has 40 divisors (see below), whose sum is σ = 1290584064. Its totient is φ = 309343680.

The previous prime is 642300601. The next prime is 642300709. The reversal of 642300656 is 656003246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107705 + ... + 113511.

Almost surely, 2^642300656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642300656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645292032).

642300656 is an abundant number, since it is smaller than the sum of its proper divisors (648283408).

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

642300656 is a wasteful number, since it uses less digits than its factorization.

642300656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6069 (or 6063 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 642300656 is about 25343.6511970947. The cubic root of 642300656 is about 862.8052688516.

The spelling of 642300656 in words is "six hundred forty-two million, three hundred thousand, six hundred fifty-six".