25640325 has 18 divisors (see below), whose sum is σ = 45925074. Its totient is φ = 13674720.

The previous prime is 25640311. The next prime is 25640339. The reversal of 25640325 is 52304652.

25640325 is a `hidden beast` number, since 256 + 403 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (25640311) and next prime (25640339).

It can be written as a sum of positive squares in 3 ways, for example, as 5846724 + 19793601 = 2418^2 + 4449^2 .

It is not a de Polignac number, because 25640325 - 2⁴ = 25640309 is a prime.

It is a super-2 number, since 2×25640325² = 1314852532211250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 56754 + ... + 57203.

It is an arithmetic number, because the mean of its divisors is an integer number (2551393).

Almost surely, 2^25640325 is an apocalyptic number.

25640325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25640325 is a deficient number, since it is larger than the sum of its proper divisors (20284749).

25640325 is a wasteful number, since it uses less digits than its factorization.

25640325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113973 (or 113965 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 25640325 is about 5063.6276521877. The cubic root of 25640325 is about 294.8771872198.

Adding to 25640325 its reverse (52304652), we get a palindrome (77944977).

The spelling of 25640325 in words is "twenty-five million, six hundred forty thousand, three hundred twenty-five".