25288889 has 4 divisors (see below), whose sum is σ = 25361700. Its totient is φ = 25216080.

The previous prime is 25288883. The next prime is 25288909. The reversal of 25288889 is 98888252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22963264 + 2325625 = 4792^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 25288889 - 2¹² = 25284793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25288883) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35882 + ... + 36579.

It is an arithmetic number, because the mean of its divisors is an integer number (6340425).

Almost surely, 2^25288889 is an apocalyptic number.

It is an amenable number.

25288889 is a deficient number, since it is larger than the sum of its proper divisors (72811).

25288889 is an equidigital number, since it uses as much as digits as its factorization.

25288889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72810.

The product of its digits is 737280, while the sum is 50.

The square root of 25288889 is about 5028.8059218864. The cubic root of 25288889 is about 293.5237519075.

The spelling of 25288889 in words is "twenty-five million, two hundred eighty-eight thousand, eight hundred eighty-nine".