621371960 has 64 divisors (see below), whose sum is σ = 1557688320. Its totient is φ = 221138560.

The previous prime is 621371957. The next prime is 621371983. The reversal of 621371960 is 69173126.

621371960 = 3613² + 3614² + ... + 3659².

It is a super-2 number, since 2×621371960² = 772206225348483200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621371960.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5657 + ... + 35703.

It is an arithmetic number, because the mean of its divisors is an integer number (24338880).

Almost surely, 2^621371960 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621371960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778844160).

621371960 is an abundant number, since it is smaller than the sum of its proper divisors (936316360).

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

621371960 is a wasteful number, since it uses less digits than its factorization.

621371960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30116 (or 30112 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 621371960 is about 24927.3335918626. Note that the first 3 decimals coincide. The cubic root of 621371960 is about 853.3303988886.

The spelling of 621371960 in words is "six hundred twenty-one million, three hundred seventy-one thousand, nine hundred sixty".