25460640 has 72 divisors (see below), whose sum is σ = 86889348. Its totient is φ = 6789120.

The previous prime is 25460623. The next prime is 25460651. The reversal of 25460640 is 4606452.

It is a happy number.

25460640 is a `hidden beast` number, since 2 + 54 + 606 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24561936 + 898704 = 4956^2 + 948^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7401 + ... + 10280.

Almost surely, 2^25460640 is an apocalyptic number.

25460640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25460640 is an abundant number, since it is smaller than the sum of its proper divisors (61428708).

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

25460640 is a wasteful number, since it uses less digits than its factorization.

25460640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17702 (or 17691 counting only the distinct ones).

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

The square root of 25460640 is about 5045.8537434214. The cubic root of 25460640 is about 294.1867479365.

The spelling of 25460640 in words is "twenty-five million, four hundred sixty thousand, six hundred forty".