621900928 has 64 divisors (see below), whose sum is σ = 1370831040. Its totient is φ = 278656000.

The previous prime is 621900907. The next prime is 621900931. The reversal of 621900928 is 829009126.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×621900928² = 773521528494522368, which contains 22 as substring.

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, 96858 + ... + 103078.

It is an arithmetic number, because the mean of its divisors is an integer number (21419235).

Almost surely, 2^621900928 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 621900928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685415520).

621900928 is an abundant number, since it is smaller than the sum of its proper divisors (748930112).

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

621900928 is a wasteful number, since it uses less digits than its factorization.

621900928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6317 (or 6305 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 621900928 is about 24937.9415349383. The cubic root of 621900928 is about 853.5724742088.

The spelling of 621900928 in words is "six hundred twenty-one million, nine hundred thousand, nine hundred twenty-eight".