25640992 has 24 divisors (see below), whose sum is σ = 54364716. Its totient is φ = 11834112.

The previous prime is 25640983. The next prime is 25641047. The reversal of 25640992 is 29904652.

It can be written as a sum of positive squares in 2 ways, for example, as 22240656 + 3400336 = 4716^2 + 1844^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30403 + ... + 31234.

Almost surely, 2^25640992 is an apocalyptic number.

It is an amenable number.

25640992 is an abundant number, since it is smaller than the sum of its proper divisors (28723724).

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

25640992 is a wasteful number, since it uses less digits than its factorization.

25640992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61660 (or 61652 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 25640992 is about 5063.6935136321. The cubic root of 25640992 is about 294.8797441476.

The spelling of 25640992 in words is "twenty-five million, six hundred forty thousand, nine hundred ninety-two".