28032831 has 8 divisors (see below), whose sum is σ = 41530160. Its totient is φ = 18688536.

The previous prime is 28032817. The next prime is 28032833. The reversal of 28032831 is 13823082.

It is not a de Polignac number, because 28032831 - 2⁷ = 28032703 is a prime.

It is a super-2 number, since 2×28032831² = 1571679227749122, 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: 1038253 = 28032831 / (2 + 8 + 0 + 3 + 2 + 8 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28032795 and 28032804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28032833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519100 + ... + 519153.

It is an arithmetic number, because the mean of its divisors is an integer number (5191270).

Almost surely, 2^28032831 is an apocalyptic number.

28032831 is a deficient number, since it is larger than the sum of its proper divisors (13497329).

28032831 is a wasteful number, since it uses less digits than its factorization.

28032831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038262 (or 1038256 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28032831 is about 5294.6039511941. The cubic root of 28032831 is about 303.7775344648. Note that the first 3 decimals are identical.

The spelling of 28032831 in words is "twenty-eight million, thirty-two thousand, eight hundred thirty-one".