28111125 has 32 divisors (see below), whose sum is σ = 53464320. Its totient is φ = 12849600.

The previous prime is 28111103. The next prime is 28111133. The reversal of 28111125 is 52111182.

It is not a de Polignac number, because 28111125 - 2⁵ = 28111093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2730 + ... + 7979.

It is an arithmetic number, because the mean of its divisors is an integer number (1670760).

Almost surely, 2^28111125 is an apocalyptic number.

28111125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28111125 is a deficient number, since it is larger than the sum of its proper divisors (25353195).

28111125 is a wasteful number, since it uses less digits than its factorization.

28111125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10734 (or 10724 counting only the distinct ones).

The product of its digits is 160, while the sum is 21.

The square root of 28111125 is about 5301.9925499759. The cubic root of 28111125 is about 304.0600823363.

The spelling of 28111125 in words is "twenty-eight million, one hundred eleven thousand, one hundred twenty-five".