28939113 has 56 divisors (see below), whose sum is σ = 50995008. Its totient is φ = 16072992.

The previous prime is 28939111. The next prime is 28939121. The reversal of 28939113 is 31193982.

It is not a de Polignac number, because 28939113 - 2¹ = 28939111 is a prime.

It is a super-2 number, since 2×28939113² = 1674944522453538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28939111) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 270406 + ... + 270512.

Almost surely, 2^28939113 is an apocalyptic number.

It is an amenable number.

28939113 is a deficient number, since it is larger than the sum of its proper divisors (22055895).

28939113 is an equidigital number, since it uses as much as digits as its factorization.

28939113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 170 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 28939113 is about 5379.5086206827. The cubic root of 28939113 is about 307.0165156439.

The spelling of 28939113 in words is "twenty-eight million, nine hundred thirty-nine thousand, one hundred thirteen".