28391125 has 32 divisors (see below), whose sum is σ = 41154048. Its totient is φ = 19152000.

The previous prime is 28391123. The next prime is 28391141. The reversal of 28391125 is 52119382.

It is not a de Polignac number, because 28391125 - 2¹ = 28391123 is a prime.

It is a Duffinian number.

Its product of digits (4320) is a multiple of the sum of its prime divisors (540).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28391123) 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, 61897 + ... + 62353.

It is an arithmetic number, because the mean of its divisors is an integer number (1286064).

Almost surely, 2^28391125 is an apocalyptic number.

28391125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28391125 is a deficient number, since it is larger than the sum of its proper divisors (12762923).

28391125 is an equidigital number, since it uses as much as digits as its factorization.

28391125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 540 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 28391125 is about 5328.3322906891. The cubic root of 28391125 is about 305.0662760210.

The spelling of 28391125 in words is "twenty-eight million, three hundred ninety-one thousand, one hundred twenty-five".