28124831 has 4 divisors (see below), whose sum is σ = 32142672. Its totient is φ = 24106992.

The previous prime is 28124827. The next prime is 28124849. The reversal of 28124831 is 13842182.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28124831 - 2² = 28124827 is a prime.

It is a super-2 number, since 2×28124831² = 1582012237557122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28124794 and 28124803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28124861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2008910 + ... + 2008923.

It is an arithmetic number, because the mean of its divisors is an integer number (8035668).

Almost surely, 2^28124831 is an apocalyptic number.

28124831 is a deficient number, since it is larger than the sum of its proper divisors (4017841).

28124831 is an equidigital number, since it uses as much as digits as its factorization.

28124831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017840.

The product of its digits is 3072, while the sum is 29.

The square root of 28124831 is about 5303.2849254024. The cubic root of 28124831 is about 304.1094906562.

The spelling of 28124831 in words is "twenty-eight million, one hundred twenty-four thousand, eight hundred thirty-one".