625390625 has 18 divisors (see below), whose sum is σ = 782226162. Its totient is φ = 500000000.

The previous prime is 625390603. The next prime is 625390639. The reversal of 625390625 is 526093526.

It can be written as a sum of positive squares in 9 ways, for example, as 430313536 + 195077089 = 20744^2 + 13967^2 .

It is not a de Polignac number, because 625390625 - 2⁸ = 625390369 is a prime.

It is a super-2 number, since 2×625390625² = 782226867675781250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 389825 + ... + 391425.

It is an arithmetic number, because the mean of its divisors is an integer number (43457009).

Almost surely, 2^625390625 is an apocalyptic number.

It is an amenable number.

625390625 is a deficient number, since it is larger than the sum of its proper divisors (156835537).

625390625 is an frugal number, since it uses more digits than its factorization.

625390625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 625390625 is about 25007.8112796782. The cubic root of 625390625 is about 855.1660587368.

It can be divided in two parts, 625 and 390625, that multiplied together give a 12-th power (244140625 = 5¹²).

The spelling of 625390625 in words is "six hundred twenty-five million, three hundred ninety thousand, six hundred twenty-five".