28938975 has 48 divisors (see below), whose sum is σ = 52413312. Its totient is φ = 14002560.

The previous prime is 28938953. The next prime is 28939003. The reversal of 28938975 is 57983982.

It is not a de Polignac number, because 28938975 - 2⁶ = 28938911 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65104 + ... + 65546.

It is an arithmetic number, because the mean of its divisors is an integer number (1091944).

Almost surely, 2^28938975 is an apocalyptic number.

28938975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28938975 is a deficient number, since it is larger than the sum of its proper divisors (23474337).

28938975 is a wasteful number, since it uses less digits than its factorization.

28938975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536 (or 531 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 28938975 is about 5379.4957942171. The cubic root of 28938975 is about 307.0160276268.

The spelling of 28938975 in words is "twenty-eight million, nine hundred thirty-eight thousand, nine hundred seventy-five".