621284928 has 56 divisors (see below), whose sum is σ = 1793260320. Its totient is φ = 188267520.

The previous prime is 621284897. The next prime is 621285001. The reversal of 621284928 is 829482126.

It is a self number, because there is not a number n which added to its sum of digits gives 621284928.

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, 144973 + ... + 149196.

Almost surely, 2^621284928 is an apocalyptic number.

It is an amenable number.

621284928 is an abundant number, since it is smaller than the sum of its proper divisors (1171975392).

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

621284928 is a wasteful number, since it uses less digits than its factorization.

621284928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294195 (or 294185 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 621284928 is about 24925.5878165391. The cubic root of 621284928 is about 853.2905566665.

The spelling of 621284928 in words is "six hundred twenty-one million, two hundred eighty-four thousand, nine hundred twenty-eight".