25640828 has 12 divisors (see below), whose sum is σ = 47511072. Its totient is φ = 12066240.

The previous prime is 25640809. The next prime is 25640831. The reversal of 25640828 is 82804652.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 188468 + ... + 188603.

It is an arithmetic number, because the mean of its divisors is an integer number (3959256).

Almost surely, 2^25640828 is an apocalyptic number.

It is an amenable number.

25640828 is a deficient number, since it is larger than the sum of its proper divisors (21870244).

25640828 is a wasteful number, since it uses less digits than its factorization.

25640828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377092 (or 377090 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 25640828 is about 5063.6773198931. The cubic root of 25640828 is about 294.8791154618.

The spelling of 25640828 in words is "twenty-five million, six hundred forty thousand, eight hundred twenty-eight".