621642056 has 32 divisors (see below), whose sum is σ = 1363074240. Its totient is φ = 260221248.

The previous prime is 621642037. The next prime is 621642067. The reversal of 621642056 is 650246126.

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, 126671 + ... + 131486.

It is an arithmetic number, because the mean of its divisors is an integer number (42596070).

Almost surely, 2^621642056 is an apocalyptic number.

It is an amenable number.

621642056 is an abundant number, since it is smaller than the sum of its proper divisors (741432184).

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

621642056 is a wasteful number, since it uses less digits than its factorization.

621642056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258213 (or 258209 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 621642056 is about 24932.7506705538. The cubic root of 621642056 is about 853.4540219653.

The spelling of 621642056 in words is "six hundred twenty-one million, six hundred forty-two thousand, fifty-six".