25640604 has 96 divisors (see below), whose sum is σ = 73543680. Its totient is φ = 7660800.

The previous prime is 25640603. The next prime is 25640617. The reversal of 25640604 is 40604652.

It is a happy number.

25640604 is a `hidden beast` number, since 2 + 56 + 4 + 0 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134149 + ... + 134339.

It is an arithmetic number, because the mean of its divisors is an integer number (766080).

Almost surely, 2^25640604 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 25640604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36771840).

25640604 is an abundant number, since it is smaller than the sum of its proper divisors (47903076).

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

25640604 is a wasteful number, since it uses less digits than its factorization.

25640604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 25640604 is about 5063.6552015318. The cubic root of 25640604 is about 294.8782567647.

It can be divided in two parts, 25640 and 604, that added together give a square (26244 = 162²).

The spelling of 25640604 in words is "twenty-five million, six hundred forty thousand, six hundred four".