25689887 has 2 divisors, whose sum is σ = 25689888. Its totient is φ = 25689886.

The previous prime is 25689869. The next prime is 25689889. The reversal of 25689887 is 78898652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25689887 is a prime.

Together with 25689889, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25689889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12844943 + 12844944.

It is an arithmetic number, because the mean of its divisors is an integer number (12844944).

Almost surely, 2^25689887 is an apocalyptic number.

25689887 is a deficient number, since it is larger than the sum of its proper divisors (1).

25689887 is an equidigital number, since it uses as much as digits as its factorization.

25689887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 53.

The square root of 25689887 is about 5068.5192117620. The cubic root of 25689887 is about 295.0670612646.

The spelling of 25689887 in words is "twenty-five million, six hundred eighty-nine thousand, eight hundred eighty-seven".