28113831 has 8 divisors (see below), whose sum is σ = 41650160. Its totient is φ = 18742536.

The previous prime is 28113829. The next prime is 28113853. The reversal of 28113831 is 13831182.

28113831 is a `hidden beast` number, since 281 + 1 + 383 + 1 = 666.

It is not a de Polignac number, because 28113831 - 2¹ = 28113829 is a prime.

It is a super-2 number, since 2×28113831² = 1580774986993122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1041253 = 28113831 / (2 + 8 + 1 + 1 + 3 + 8 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28113795 and 28113804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28113431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520600 + ... + 520653.

It is an arithmetic number, because the mean of its divisors is an integer number (5206270).

Almost surely, 2^28113831 is an apocalyptic number.

28113831 is a deficient number, since it is larger than the sum of its proper divisors (13536329).

28113831 is a wasteful number, since it uses less digits than its factorization.

28113831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041262 (or 1041256 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 28113831 is about 5302.2477309156. The cubic root of 28113831 is about 304.0698383811.

The spelling of 28113831 in words is "twenty-eight million, one hundred thirteen thousand, eight hundred thirty-one".