25128625 has 16 divisors (see below), whose sum is σ = 31960656. Its totient is φ = 19718400.

The previous prime is 25128619. The next prime is 25128643. The reversal of 25128625 is 52682152.

It can be written as a sum of positive squares in 8 ways, for example, as 9541921 + 15586704 = 3089^2 + 3948^2 .

It is not a de Polignac number, because 25128625 - 2³ = 25128617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4729 + ... + 8521.

It is an arithmetic number, because the mean of its divisors is an integer number (1997541).

Almost surely, 2^25128625 is an apocalyptic number.

25128625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25128625 is a deficient number, since it is larger than the sum of its proper divisors (6832031).

25128625 is an equidigital number, since it uses as much as digits as its factorization.

25128625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861 (or 3851 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 25128625 is about 5012.8459980335. The cubic root of 25128625 is about 292.9023852938.

The spelling of 25128625 in words is "twenty-five million, one hundred twenty-eight thousand, six hundred twenty-five".