621804672 has 48 divisors (see below), whose sum is σ = 1789311030. Its totient is φ = 207267840.

The previous prime is 621804661. The next prime is 621804707. The reversal of 621804672 is 276408126.

It can be written as a sum of positive squares in only one way, i.e., 621804096 + 576 = 24936^2 + 24^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 268729 + ... + 271032.

Almost surely, 2^621804672 is an apocalyptic number.

It is an amenable number.

621804672 is an abundant number, since it is smaller than the sum of its proper divisors (1167506358).

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

621804672 is a wasteful number, since it uses less digits than its factorization.

621804672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539781 (or 539766 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 621804672 is about 24936.0115495642. The cubic root of 621804672 is about 853.5284341226.

The spelling of 621804672 in words is "six hundred twenty-one million, eight hundred four thousand, six hundred seventy-two".