25558990 has 64 divisors (see below), whose sum is σ = 52799040. Its totient is φ = 8847360.

The previous prime is 25558987. The next prime is 25558991. The reversal of 25558990 is 9985552.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25558991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132334 + ... + 132526.

It is an arithmetic number, because the mean of its divisors is an integer number (824985).

Almost surely, 2^25558990 is an apocalyptic number.

25558990 is an abundant number, since it is smaller than the sum of its proper divisors (27240050).

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

25558990 is a wasteful number, since it uses less digits than its factorization.

25558990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 162000, while the sum is 43.

The square root of 25558990 is about 5055.5899754628. The cubic root of 25558990 is about 294.5650585588.

The spelling of 25558990 in words is "twenty-five million, five hundred fifty-eight thousand, nine hundred ninety".