25428865 has 24 divisors (see below), whose sum is σ = 38192832. Its totient is φ = 15790080.

The previous prime is 25428857. The next prime is 25428881. The reversal of 25428865 is 56882452.

It is not a de Polignac number, because 25428865 - 2³ = 25428857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98817 + ... + 99073.

It is an arithmetic number, because the mean of its divisors is an integer number (1591368).

Almost surely, 2^25428865 is an apocalyptic number.

It is an amenable number.

25428865 is a deficient number, since it is larger than the sum of its proper divisors (12763967).

25428865 is an equidigital number, since it uses as much as digits as its factorization.

25428865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 280 counting only the distinct ones).

The product of its digits is 153600, while the sum is 40.

The square root of 25428865 is about 5042.7041356796. The cubic root of 25428865 is about 294.0643148358.

The spelling of 25428865 in words is "twenty-five million, four hundred twenty-eight thousand, eight hundred sixty-five".