25705690 has 16 divisors (see below), whose sum is σ = 46350792. Its totient is φ = 10264384.

The previous prime is 25705643. The next prime is 25705703. The reversal of 25705690 is 9650752.

It can be written as a sum of positive squares in 4 ways, for example, as 20948929 + 4756761 = 4577^2 + 2181^2 .

It is a super-2 number, since 2×25705690² = 1321564996752200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4872 + ... + 8668.

Almost surely, 2^25705690 is an apocalyptic number.

25705690 is a deficient number, since it is larger than the sum of its proper divisors (20645102).

25705690 is a wasteful number, since it uses less digits than its factorization.

25705690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 25705690 is about 5070.0779086716. The cubic root of 25705690 is about 295.1275518508.

The spelling of 25705690 in words is "twenty-five million, seven hundred five thousand, six hundred ninety".