25925640 has 64 divisors (see below), whose sum is σ = 83764800. Its totient is φ = 6381312.

The previous prime is 25925621. The next prime is 25925651. The reversal of 25925640 is 4652952.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6750 + ... + 9869.

It is an arithmetic number, because the mean of its divisors is an integer number (1308825).

Almost surely, 2^25925640 is an apocalyptic number.

25925640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25925640 is an abundant number, since it is smaller than the sum of its proper divisors (57839160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25925640 is a wasteful number, since it uses less digits than its factorization.

25925640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16646 (or 16642 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 25925640 is about 5091.7226947272. The cubic root of 25925640 is about 295.9669125421.

It can be divided in two parts, 25925 and 640, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 25925640 in words is "twenty-five million, nine hundred twenty-five thousand, six hundred forty".