28120125 has 64 divisors (see below), whose sum is σ = 54183168. Its totient is φ = 12800000.

The previous prime is 28120109. The next prime is 28120153. The reversal of 28120125 is 52102182.

It is a happy number.

It is not a de Polignac number, because 28120125 - 2⁴ = 28120109 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 69925 + ... + 70325.

It is an arithmetic number, because the mean of its divisors is an integer number (846612).

Almost surely, 2^28120125 is an apocalyptic number.

28120125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28120125 is a deficient number, since it is larger than the sum of its proper divisors (26063043).

28120125 is a wasteful number, since it uses less digits than its factorization.

28120125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 28120125 is about 5302.8412195728. The cubic root of 28120125 is about 304.0925279576.

The spelling of 28120125 in words is "twenty-eight million, one hundred twenty thousand, one hundred twenty-five".