25881604 has 18 divisors (see below), whose sum is σ = 52687950. Its totient is φ = 11092032.

The previous prime is 25881593. The next prime is 25881617. The reversal of 25881604 is 40618852.

It can be written as a sum of positive squares in only one way, i.e., 23059204 + 2822400 = 4802^2 + 1680^2 .

It is a super-2 number, since 2×25881604² = 1339714851225632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25881604.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65829 + ... + 66220.

Almost surely, 2^25881604 is an apocalyptic number.

It is an amenable number.

25881604 is an abundant number, since it is smaller than the sum of its proper divisors (26806346).

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

25881604 is a wasteful number, since it uses less digits than its factorization.

25881604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132067 (or 132058 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 25881604 is about 5087.3965837155. The cubic root of 25881604 is about 295.7992460273.

The spelling of 25881604 in words is "twenty-five million, eight hundred eighty-one thousand, six hundred four".