28108031 has 8 divisors (see below), whose sum is σ = 32184480. Its totient is φ = 24046848.

The previous prime is 28108027. The next prime is 28108051. The reversal of 28108031 is 13080182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28108031 - 2² = 28108027 is a prime.

It is a super-2 number, since 2×28108031² = 1580122813393922, 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 = 28107988 and 28108006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28108051) 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, 455 + ... + 7511.

It is an arithmetic number, because the mean of its divisors is an integer number (4023060).

Almost surely, 2^28108031 is an apocalyptic number.

28108031 is a deficient number, since it is larger than the sum of its proper divisors (4076449).

28108031 is an equidigital number, since it uses as much as digits as its factorization.

28108031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7633.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 28108031 is about 5301.7007648490. The cubic root of 28108031 is about 304.0489266531.

The spelling of 28108031 in words is "twenty-eight million, one hundred eight thousand, thirty-one".