25640712 has 40 divisors (see below), whose sum is σ = 71819550. Its totient is φ = 8546688.

The previous prime is 25640683. The next prime is 25640729. The reversal of 25640712 is 21704652.

25640712 is a `hidden beast` number, since 2 + 5 + 640 + 7 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 4901796 = 4554^2 + 2214^2 .

It is a super-2 number, since 2×25640712² = 1314892223733888, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19137 + ... + 20432.

Almost surely, 2^25640712 is an apocalyptic number.

It is an amenable number.

25640712 is an abundant number, since it is smaller than the sum of its proper divisors (46178838).

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

25640712 is a wasteful number, since it uses less digits than its factorization.

25640712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39587 (or 39574 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 25640712 is about 5063.6658657538. The cubic root of 25640712 is about 294.8786707800.

The spelling of 25640712 in words is "twenty-five million, six hundred forty thousand, seven hundred twelve".