28011975 has 24 divisors (see below), whose sum is σ = 46663680. Its totient is φ = 14826720.

The previous prime is 28011943. The next prime is 28011989. The reversal of 28011975 is 57911082.

It is not a de Polignac number, because 28011975 - 2⁵ = 28011943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9082 + ... + 11768.

It is an arithmetic number, because the mean of its divisors is an integer number (1944320).

Almost surely, 2^28011975 is an apocalyptic number.

28011975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28011975 is a deficient number, since it is larger than the sum of its proper divisors (18651705).

28011975 is a wasteful number, since it uses less digits than its factorization.

28011975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2834 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 28011975 is about 5292.6340323132. The cubic root of 28011975 is about 303.7021804855.

The spelling of 28011975 in words is "twenty-eight million, eleven thousand, nine hundred seventy-five".