28117875 has 32 divisors (see below), whose sum is σ = 47331648. Its totient is φ = 14822400.

The previous prime is 28117871. The next prime is 28117877. The reversal of 28117875 is 57871182.

It is not a de Polignac number, because 28117875 - 2² = 28117871 is a prime.

It is a super-2 number, since 2×28117875² = 1581229789031250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28117871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35989 + ... + 36761.

It is an arithmetic number, because the mean of its divisors is an integer number (1479114).

Almost surely, 2^28117875 is an apocalyptic number.

28117875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28117875 is a deficient number, since it is larger than the sum of its proper divisors (19213773).

28117875 is an equidigital number, since it uses as much as digits as its factorization.

28117875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 878 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The square root of 28117875 is about 5302.6290649073. The cubic root of 28117875 is about 304.0844172014.

The spelling of 28117875 in words is "twenty-eight million, one hundred seventeen thousand, eight hundred seventy-five".