25217990 has 16 divisors (see below), whose sum is σ = 51877152. Its totient is φ = 8646144.

The previous prime is 25217989. The next prime is 25218013. The reversal of 25217990 is 9971252.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25217990.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180059 + ... + 180198.

It is an arithmetic number, because the mean of its divisors is an integer number (3242322).

Almost surely, 2^25217990 is an apocalyptic number.

25217990 is an abundant number, since it is smaller than the sum of its proper divisors (26659162).

25217990 is a wasteful number, since it uses less digits than its factorization.

25217990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360271.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 25217990 is about 5021.7516864138. The cubic root of 25217990 is about 293.2491910292.

The spelling of 25217990 in words is "twenty-five million, two hundred seventeen thousand, nine hundred ninety".