25640990 has 16 divisors (see below), whose sum is σ = 47280240. Its totient is φ = 10006080.

The previous prime is 25640983. The next prime is 25641047. The reversal of 25640990 is 9904652.

It is a self number, because there is not a number n which added to its sum of digits gives 25640990.

It is a congruent number.

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, 30860 + ... + 31679.

It is an arithmetic number, because the mean of its divisors is an integer number (2955015).

Almost surely, 2^25640990 is an apocalyptic number.

25640990 is a deficient number, since it is larger than the sum of its proper divisors (21639250).

25640990 is a wasteful number, since it uses less digits than its factorization.

25640990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62587.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 25640990 is about 5063.6933161478. The cubic root of 25640990 is about 294.8797364807.

The spelling of 25640990 in words is "twenty-five million, six hundred forty thousand, nine hundred ninety".