28715825 has 12 divisors (see below), whose sum is σ = 36366720. Its totient is φ = 22482960.

The previous prime is 28715807. The next prime is 28715833. The reversal of 28715825 is 52851782.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28715825 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11045 + ... + 13394.

It is an arithmetic number, because the mean of its divisors is an integer number (3030560).

Almost surely, 2^28715825 is an apocalyptic number.

28715825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28715825 is a deficient number, since it is larger than the sum of its proper divisors (7650895).

28715825 is a wasteful number, since it uses less digits than its factorization.

28715825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24496 (or 24491 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The square root of 28715825 is about 5358.7148645921. The cubic root of 28715825 is about 306.2248514682.

The spelling of 28715825 in words is "twenty-eight million, seven hundred fifteen thousand, eight hundred twenty-five".