621947688 has 32 divisors (see below), whose sum is σ = 1608487200. Its totient is φ = 200166848.

The previous prime is 621947671. The next prime is 621947701. The reversal of 621947688 is 886749126.

It is a self number, because there is not a number n which added to its sum of digits gives 621947688.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446106 + ... + 447497.

It is an arithmetic number, because the mean of its divisors is an integer number (50265225).

Almost surely, 2^621947688 is an apocalyptic number.

It is an amenable number.

621947688 is an abundant number, since it is smaller than the sum of its proper divisors (986539512).

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

621947688 is a wasteful number, since it uses less digits than its factorization.

621947688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893641 (or 893637 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 621947688 is about 24938.8790445762. The cubic root of 621947688 is about 853.5938667097.

The spelling of 621947688 in words is "six hundred twenty-one million, nine hundred forty-seven thousand, six hundred eighty-eight".