28865875 has 16 divisors (see below), whose sum is σ = 37271520. Its totient is φ = 22293600.

The previous prime is 28865861. The next prime is 28865887. The reversal of 28865875 is 57856882.

It is a happy number.

It is not a de Polignac number, because 28865875 - 2⁵ = 28865843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (2329470).

Almost surely, 2^28865875 is an apocalyptic number.

28865875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28865875 is a deficient number, since it is larger than the sum of its proper divisors (8405645).

28865875 is an equidigital number, since it uses as much as digits as its factorization.

28865875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8007 (or 7997 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 49.

The square root of 28865875 is about 5372.6971811186. The cubic root of 28865875 is about 306.7573016340.

The spelling of 28865875 in words is "twenty-eight million, eight hundred sixty-five thousand, eight hundred seventy-five".