28905075 has 18 divisors (see below), whose sum is σ = 51772604. Its totient is φ = 15415920.

The previous prime is 28905059. The next prime is 28905133. The reversal of 28905075 is 57050982.

It is not a de Polignac number, because 28905075 - 2⁴ = 28905059 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 64009 + ... + 64458.

Almost surely, 2^28905075 is an apocalyptic number.

28905075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28905075 is a deficient number, since it is larger than the sum of its proper divisors (22867529).

28905075 is a wasteful number, since it uses less digits than its factorization.

28905075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128483 (or 128475 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 28905075 is about 5376.3440180108. The cubic root of 28905075 is about 306.8960981315.

The spelling of 28905075 in words is "twenty-eight million, nine hundred five thousand, seventy-five".