621445444 has 12 divisors (see below), whose sum is σ = 1087785664. Its totient is φ = 310649544.

The previous prime is 621445439. The next prime is 621445471. The reversal of 621445444 is 444544126.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3769 + ... + 35455.

Almost surely, 2^621445444 is an apocalyptic number.

It is an amenable number.

621445444 is a deficient number, since it is larger than the sum of its proper divisors (466340220).

621445444 is a wasteful number, since it uses less digits than its factorization.

621445444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36594 (or 36592 counting only the distinct ones).

The product of its digits is 61440, while the sum is 34.

The square root of 621445444 is about 24928.8075125947. The cubic root of 621445444 is about 853.3640360996.

The spelling of 621445444 in words is "six hundred twenty-one million, four hundred forty-five thousand, four hundred forty-four".