621668885 has 16 divisors (see below), whose sum is σ = 810600960. Its totient is φ = 455958720.

The previous prime is 621668849. The next prime is 621668951. The reversal of 621668885 is 588866126.

It is not a de Polignac number, because 621668885 - 2⁶ = 621668821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102602 + ... + 108491.

It is an arithmetic number, because the mean of its divisors is an integer number (50662560).

Almost surely, 2^621668885 is an apocalyptic number.

It is an amenable number.

621668885 is a deficient number, since it is larger than the sum of its proper divisors (188932075).

621668885 is a wasteful number, since it uses less digits than its factorization.

621668885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211148.

The product of its digits is 1105920, while the sum is 50.

The square root of 621668885 is about 24933.2886920278. The cubic root of 621668885 is about 853.4662996570.

The spelling of 621668885 in words is "six hundred twenty-one million, six hundred sixty-eight thousand, eight hundred eighty-five".