28239125 has 32 divisors (see below), whose sum is σ = 37975392. Its totient is φ = 20889600.

The previous prime is 28239083. The next prime is 28239131. The reversal of 28239125 is 52193282.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 15437041 + 12802084 = 3929^2 + 3578^2 .

It is not a de Polignac number, because 28239125 - 2¹⁰ = 28238101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28239091 and 28239100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206057 + ... + 206193.

It is an arithmetic number, because the mean of its divisors is an integer number (1186731).

Almost surely, 2^28239125 is an apocalyptic number.

28239125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28239125 is a deficient number, since it is larger than the sum of its proper divisors (9736267).

28239125 is a wasteful number, since it uses less digits than its factorization.

28239125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 256 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 28239125 is about 5314.0497739483. The cubic root of 28239125 is about 304.5208817263.

The spelling of 28239125 in words is "twenty-eight million, two hundred thirty-nine thousand, one hundred twenty-five".