28155125 has 8 divisors (see below), whose sum is σ = 35137752. Its totient is φ = 22524000.

The previous prime is 28155109. The next prime is 28155133. The reversal of 28155125 is 52155182.

It can be written as a sum of positive squares in 4 ways, for example, as 2531281 + 25623844 = 1591^2 + 5062^2 .

It is not a de Polignac number, because 28155125 - 2⁴ = 28155109 is a prime.

It is a super-2 number, since 2×28155125² = 1585422127531250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112496 + ... + 112745.

It is an arithmetic number, because the mean of its divisors is an integer number (4392219).

Almost surely, 2^28155125 is an apocalyptic number.

28155125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28155125 is a deficient number, since it is larger than the sum of its proper divisors (6982627).

28155125 is an equidigital number, since it uses as much as digits as its factorization.

28155125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225256 (or 225246 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The square root of 28155125 is about 5306.1403109982. The cubic root of 28155125 is about 304.2186396041.

The spelling of 28155125 in words is "twenty-eight million, one hundred fifty-five thousand, one hundred twenty-five".