621180664 has 32 divisors (see below), whose sum is σ = 1255544640. Its totient is φ = 286416000.

The previous prime is 621180653. The next prime is 621180671. The reversal of 621180664 is 466081126.

621180664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

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, 133009 + ... + 137599.

It is an arithmetic number, because the mean of its divisors is an integer number (39235770).

Almost surely, 2^621180664 is an apocalyptic number.

It is an amenable number.

621180664 is an abundant number, since it is smaller than the sum of its proper divisors (634363976).

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

621180664 is a wasteful number, since it uses less digits than its factorization.

621180664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911 (or 5907 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 621180664 is about 24923.4962234435. The cubic root of 621180664 is about 853.2428209390.

The spelling of 621180664 in words is "six hundred twenty-one million, one hundred eighty thousand, six hundred sixty-four".