25556889 has 4 divisors (see below), whose sum is σ = 34075856. Its totient is φ = 17037924.

The previous prime is 25556879. The next prime is 25556891. The reversal of 25556889 is 98865552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25556889 - 2⁴ = 25556873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (25556849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4259479 + ... + 4259484.

It is an arithmetic number, because the mean of its divisors is an integer number (8518964).

Almost surely, 2^25556889 is an apocalyptic number.

It is an amenable number.

25556889 is a deficient number, since it is larger than the sum of its proper divisors (8518967).

25556889 is an equidigital number, since it uses as much as digits as its factorization.

25556889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518966.

The product of its digits is 864000, while the sum is 48.

The square root of 25556889 is about 5055.3821813984. The cubic root of 25556889 is about 294.5569870590.

The spelling of 25556889 in words is "twenty-five million, five hundred fifty-six thousand, eight hundred eighty-nine".