28112931 has 48 divisors (see below), whose sum is σ = 51217920. Its totient is φ = 14434560.

The previous prime is 28112879. The next prime is 28113011. The reversal of 28112931 is 13921182.

It is not a de Polignac number, because 28112931 - 2¹⁵ = 28080163 is a prime.

It is a super-2 number, since 2×28112931² = 1580673778821522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28112895 and 28112904.

It is not an unprimeable number, because it can be changed into a prime (28112131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78130 + ... + 78488.

It is an arithmetic number, because the mean of its divisors is an integer number (1067040).

Almost surely, 2^28112931 is an apocalyptic number.

28112931 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28112931 is a deficient number, since it is larger than the sum of its proper divisors (23104989).

28112931 is a wasteful number, since it uses less digits than its factorization.

28112931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 493 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 28112931 is about 5302.1628605693. The cubic root of 28112931 is about 304.0665936463.

The spelling of 28112931 in words is "twenty-eight million, one hundred twelve thousand, nine hundred thirty-one".