621332644 has 12 divisors (see below), whose sum is σ = 1102647168. Its totient is φ = 306290600.

The previous prime is 621332639. The next prime is 621332651. The reversal of 621332644 is 446233126.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093612 + ... + 1094179.

It is an arithmetic number, because the mean of its divisors is an integer number (91887264).

Almost surely, 2^621332644 is an apocalyptic number.

It is an amenable number.

621332644 is a deficient number, since it is larger than the sum of its proper divisors (481314524).

621332644 is a wasteful number, since it uses less digits than its factorization.

621332644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187866 (or 2187864 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 621332644 is about 24926.5449671630. The cubic root of 621332644 is about 853.3124009487.

The spelling of 621332644 in words is "six hundred twenty-one million, three hundred thirty-two thousand, six hundred forty-four".