621666672 has 40 divisors (see below), whose sum is σ = 1751971200. Its totient is φ = 188383680.

The previous prime is 621666671. The next prime is 621666679. The reversal of 621666672 is 276666126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621666671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588172 + ... + 589227.

It is an arithmetic number, because the mean of its divisors is an integer number (43799280).

Almost surely, 2^621666672 is an apocalyptic number.

It is an amenable number.

621666672 is an abundant number, since it is smaller than the sum of its proper divisors (1130304528).

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

621666672 is a wasteful number, since it uses less digits than its factorization.

621666672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177421 (or 1177415 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 621666672 is about 24933.2443135666. The cubic root of 621666672 is about 853.4652869405.

The spelling of 621666672 in words is "six hundred twenty-one million, six hundred sixty-six thousand, six hundred seventy-two".