621445425 has 24 divisors (see below), whose sum is σ = 1037641920. Its totient is φ = 328152000.

The previous prime is 621445411. The next prime is 621445439. The reversal of 621445425 is 524544126.

It is an interprime number because it is at equal distance from previous prime (621445411) and next prime (621445439).

It is not a de Polignac number, because 621445425 - 2⁵ = 621445393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33445 + ... + 48594.

It is an arithmetic number, because the mean of its divisors is an integer number (43235080).

Almost surely, 2^621445425 is an apocalyptic number.

It is an amenable number.

621445425 is a deficient number, since it is larger than the sum of its proper divisors (416196495).

621445425 is a wasteful number, since it uses less digits than its factorization.

621445425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82153 (or 82148 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

The square root of 621445425 is about 24928.8071315095. The cubic root of 621445425 is about 853.3640274027.

The spelling of 621445425 in words is "six hundred twenty-one million, four hundred forty-five thousand, four hundred twenty-five".