25540864 has 72 divisors (see below), whose sum is σ = 55188000. Its totient is φ = 11759616.

The previous prime is 25540847. The next prime is 25540873. The reversal of 25540864 is 46804552.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286932 + ... + 287020.

It is an arithmetic number, because the mean of its divisors is an integer number (766500).

Almost surely, 2^25540864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25540864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27594000).

25540864 is an abundant number, since it is smaller than the sum of its proper divisors (29647136).

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

25540864 is an equidigital number, since it uses as much as digits as its factorization.

25540864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 25540864 is about 5053.7969884039. The cubic root of 25540864 is about 294.4954085853.

The spelling of 25540864 in words is "twenty-five million, five hundred forty thousand, eight hundred sixty-four".