28665875 has 24 divisors (see below), whose sum is σ = 41112864. Its totient is φ = 19548000.

The previous prime is 28665869. The next prime is 28665881. The reversal of 28665875 is 57856682.

It is an interprime number because it is at equal distance from previous prime (28665869) and next prime (28665881).

It is not a de Polignac number, because 28665875 - 2⁸ = 28665619 is a prime.

It is a Duffinian number.

Its product of digits (806400) is a multiple of the sum of its prime factors (384).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158285 + ... + 158465.

It is an arithmetic number, because the mean of its divisors is an integer number (1713036).

Almost surely, 2^28665875 is an apocalyptic number.

28665875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28665875 is a deficient number, since it is larger than the sum of its proper divisors (12446989).

28665875 is an frugal number, since it uses more digits than its factorization.

28665875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 193 counting only the distinct ones).

The product of its digits is 806400, while the sum is 47.

The square root of 28665875 is about 5354.0522037052. The cubic root of 28665875 is about 306.0471932281.

The spelling of 28665875 in words is "twenty-eight million, six hundred sixty-five thousand, eight hundred seventy-five".