28665125 has 8 divisors (see below), whose sum is σ = 35774232. Its totient is φ = 22932000.

The previous prime is 28665101. The next prime is 28665139. The reversal of 28665125 is 52156682.

It can be written as a sum of positive squares in 4 ways, for example, as 1437601 + 27227524 = 1199^2 + 5218^2 .

It is not a de Polignac number, because 28665125 - 2¹² = 28661029 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 114536 + ... + 114785.

It is an arithmetic number, because the mean of its divisors is an integer number (4471779).

Almost surely, 2^28665125 is an apocalyptic number.

28665125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28665125 is a deficient number, since it is larger than the sum of its proper divisors (7109107).

28665125 is an equidigital number, since it uses as much as digits as its factorization.

28665125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229336 (or 229326 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 28665125 is about 5353.9821628392. The cubic root of 28665125 is about 306.0445241149.

The spelling of 28665125 in words is "twenty-eight million, six hundred sixty-five thousand, one hundred twenty-five".