25641018 has 36 divisors (see below), whose sum is σ = 60164910. Its totient is φ = 7888608.

The previous prime is 25640983. The next prime is 25641047. The reversal of 25641018 is 81014652.

25641018 is a `hidden beast` number, since 2 + 5 + 641 + 0 + 18 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 8277129 + 17363889 = 2877^2 + 4167^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25640982 and 25641000.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1173 + ... + 7256.

Almost surely, 2^25641018 is an apocalyptic number.

25641018 is an abundant number, since it is smaller than the sum of its proper divisors (34523892).

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

25641018 is a wasteful number, since it uses less digits than its factorization.

25641018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8463 (or 8447 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 25641018 is about 5063.6960809274. The cubic root of 25641018 is about 294.8798438171.

The spelling of 25641018 in words is "twenty-five million, six hundred forty-one thousand, eighteen".