25815625 has 24 divisors (see below), whose sum is σ = 35247744. Its totient is φ = 18750000.

The previous prime is 25815619. The next prime is 25815649. The reversal of 25815625 is 52651852.

It is not a de Polignac number, because 25815625 - 2³ = 25815617 is a prime.

It is a Duffinian number.

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, 34000 + ... + 34750.

It is an arithmetic number, because the mean of its divisors is an integer number (1468656).

Almost surely, 2^25815625 is an apocalyptic number.

25815625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25815625 is a deficient number, since it is larger than the sum of its proper divisors (9432119).

25815625 is an frugal number, since it uses more digits than its factorization.

25815625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 767 counting only the distinct ones).

The product of its digits is 24000, while the sum is 34.

The square root of 25815625 is about 5080.9078913123. The cubic root of 25815625 is about 295.5476755007.

The spelling of 25815625 in words is "twenty-five million, eight hundred fifteen thousand, six hundred twenty-five".