621268920 has 64 divisors (see below), whose sum is σ = 2070900000. Its totient is φ = 165671424.

The previous prime is 621268919. The next prime is 621268931. The reversal of 621268920 is 29862126.

It is a happy number.

621268920 is a `hidden beast` number, since 621 + 2 + 6 + 8 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 286545 + ... + 288704.

Almost surely, 2^621268920 is an apocalyptic number.

621268920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621268920 is an abundant number, since it is smaller than the sum of its proper divisors (1449631080).

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

621268920 is a wasteful number, since it uses less digits than its factorization.

621268920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575269 (or 575259 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 621268920 is about 24925.2666986735. The cubic root of 621268920 is about 853.2832279879.

The spelling of 621268920 in words is "six hundred twenty-one million, two hundred sixty-eight thousand, nine hundred twenty".