28388525 has 12 divisors (see below), whose sum is σ = 38402304. Its totient is φ = 20646000.

The previous prime is 28388513. The next prime is 28388533. The reversal of 28388525 is 52588382.

It is not a de Polignac number, because 28388525 - 2²⁴ = 11611309 is a prime.

It is a Duffinian number.

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 51341 + ... + 51890.

It is an arithmetic number, because the mean of its divisors is an integer number (3200192).

Almost surely, 2^28388525 is an apocalyptic number.

28388525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28388525 is a deficient number, since it is larger than the sum of its proper divisors (10013779).

28388525 is a wasteful number, since it uses less digits than its factorization.

28388525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103252 (or 103247 counting only the distinct ones).

The product of its digits is 153600, while the sum is 41.

The square root of 28388525 is about 5328.0883063253. The cubic root of 28388525 is about 305.0569632923.

The spelling of 28388525 in words is "twenty-eight million, three hundred eighty-eight thousand, five hundred twenty-five".