25808789 has 2 divisors, whose sum is σ = 25808790. Its totient is φ = 25808788.

The previous prime is 25808749. The next prime is 25808791. The reversal of 25808789 is 98780852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 11444689 = 3790^2 + 3383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25808789 is a prime.

Together with 25808791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25808719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12904394 + 12904395.

It is an arithmetic number, because the mean of its divisors is an integer number (12904395).

Almost surely, 2^25808789 is an apocalyptic number.

It is an amenable number.

25808789 is a deficient number, since it is larger than the sum of its proper divisors (1).

25808789 is an equidigital number, since it uses as much as digits as its factorization.

25808789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 25808789 is about 5080.2351323536. The cubic root of 25808789 is about 295.5215861037.

The spelling of 25808789 in words is "twenty-five million, eight hundred eight thousand, seven hundred eighty-nine".