621473728 has 14 divisors (see below), whose sum is σ = 1233237056. Its totient is φ = 310736832.

The previous prime is 621473701. The next prime is 621473737. The reversal of 621473728 is 827374126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4855200 + ... + 4855327.

Almost surely, 2^621473728 is an apocalyptic number.

It is an amenable number.

621473728 is a deficient number, since it is larger than the sum of its proper divisors (611763328).

621473728 is an equidigital number, since it uses as much as digits as its factorization.

621473728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9710539 (or 9710529 counting only the distinct ones).

The product of its digits is 112896, while the sum is 40.

The square root of 621473728 is about 24929.3748016271. The cubic root of 621473728 is about 853.3769823593.

The spelling of 621473728 in words is "six hundred twenty-one million, four hundred seventy-three thousand, seven hundred twenty-eight".