621565625 has 12 divisors (see below), whose sum is σ = 776911212. Its totient is φ = 497250000.

The previous prime is 621565603. The next prime is 621565631. The reversal of 621565625 is 526565126.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 588984361 + 32581264 = 24269^2 + 5708^2 .

It is not a de Polignac number, because 621565625 - 2⁶ = 621565561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96326 + ... + 102575.

It is an arithmetic number, because the mean of its divisors is an integer number (64742601).

Almost surely, 2^621565625 is an apocalyptic number.

It is an amenable number.

621565625 is a deficient number, since it is larger than the sum of its proper divisors (155345587).

621565625 is an frugal number, since it uses more digits than its factorization.

621565625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198926 (or 198906 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 621565625 is about 24931.2178804005. The cubic root of 621565625 is about 853.4190430911.

The spelling of 621565625 in words is "six hundred twenty-one million, five hundred sixty-five thousand, six hundred twenty-five".