28775123 has 6 divisors (see below), whose sum is σ = 31159044. Its totient is φ = 26561496.

The previous prime is 28775113. The next prime is 28775129. The reversal of 28775123 is 32157782.

It is not a de Polignac number, because 28775123 - 2⁴ = 28775107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28775129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84965 + ... + 85302.

It is an arithmetic number, because the mean of its divisors is an integer number (5193174).

Almost surely, 2^28775123 is an apocalyptic number.

28775123 is a deficient number, since it is larger than the sum of its proper divisors (2383921).

28775123 is a wasteful number, since it uses less digits than its factorization.

28775123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170293 (or 170280 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 28775123 is about 5364.2448676398. The cubic root of 28775123 is about 306.4354906829.

It can be divided in two parts, 2877 and 5123, that added together give a cube (8000 = 20³).

The spelling of 28775123 in words is "twenty-eight million, seven hundred seventy-five thousand, one hundred twenty-three".