25988889 has 4 divisors (see below), whose sum is σ = 34651856. Its totient is φ = 17325924.

The previous prime is 25988887. The next prime is 25988891. The reversal of 25988889 is 98888952.

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 an interprime number because it is at equal distance from previous prime (25988887) and next prime (25988891).

It is not a de Polignac number, because 25988889 - 2¹ = 25988887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25988887) 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, 4331479 + ... + 4331484.

It is an arithmetic number, because the mean of its divisors is an integer number (8662964).

Almost surely, 2^25988889 is an apocalyptic number.

It is an amenable number.

25988889 is a deficient number, since it is larger than the sum of its proper divisors (8662967).

25988889 is an equidigital number, since it uses as much as digits as its factorization.

25988889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662966.

The product of its digits is 3317760, while the sum is 57.

The square root of 25988889 is about 5097.9298739783. The cubic root of 25988889 is about 296.2074004512.

The spelling of 25988889 in words is "twenty-five million, nine hundred eighty-eight thousand, eight hundred eighty-nine".