621464660 has 24 divisors (see below), whose sum is σ = 1313725056. Its totient is φ = 246938400.

The previous prime is 621464647. The next prime is 621464677. The reversal of 621464660 is 66464126.

It is a self number, because there is not a number n which added to its sum of digits gives 621464660.

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, 99872 + ... + 105911.

It is an arithmetic number, because the mean of its divisors is an integer number (54738544).

Almost surely, 2^621464660 is an apocalyptic number.

It is an amenable number.

621464660 is an abundant number, since it is smaller than the sum of its proper divisors (692260396).

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

621464660 is a wasteful number, since it uses less digits than its factorization.

621464660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205943 (or 205941 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 621464660 is about 24929.1929271687. The cubic root of 621464660 is about 853.3728317627.

The spelling of 621464660 in words is "six hundred twenty-one million, four hundred sixty-four thousand, six hundred sixty".