25640886 has 8 divisors (see below), whose sum is σ = 51281784. Its totient is φ = 8546960.

The previous prime is 25640863. The next prime is 25640893. The reversal of 25640886 is 68804652.

It is a sphenic number, since it is the product of 3 distinct primes.

25640886 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136735 + ... + 2136746.

It is an arithmetic number, because the mean of its divisors is an integer number (6410223).

Almost surely, 2^25640886 is an apocalyptic number.

25640886 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25640886 is a wasteful number, since it uses less digits than its factorization.

25640886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273486.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 25640886 is about 5063.6830469531. The cubic root of 25640886 is about 294.8793378022.

The spelling of 25640886 in words is "twenty-five million, six hundred forty thousand, eight hundred eighty-six".