621163820 has 12 divisors (see below), whose sum is σ = 1304444064. Its totient is φ = 248465520.

The previous prime is 621163801. The next prime is 621163849. The reversal of 621163820 is 28361126.

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, 15529076 + ... + 15529115.

It is an arithmetic number, because the mean of its divisors is an integer number (108703672).

Almost surely, 2^621163820 is an apocalyptic number.

It is an amenable number.

621163820 is an abundant number, since it is smaller than the sum of its proper divisors (683280244).

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

621163820 is a wasteful number, since it uses less digits than its factorization.

621163820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31058200 (or 31058198 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 621163820 is about 24923.1583070846. The cubic root of 621163820 is about 853.2351086621.

The spelling of 621163820 in words is "six hundred twenty-one million, one hundred sixty-three thousand, eight hundred twenty".