28725275 has 12 divisors (see below), whose sum is σ = 37168752. Its totient is φ = 21980640.

The previous prime is 28725253. The next prime is 28725293. The reversal of 28725275 is 57252782.

It is not a de Polignac number, because 28725275 - 2¹⁴ = 28708891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24404 + ... + 25553.

It is an arithmetic number, because the mean of its divisors is an integer number (3097396).

Almost surely, 2^28725275 is an apocalyptic number.

28725275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28725275 is a deficient number, since it is larger than the sum of its proper divisors (8443477).

28725275 is a wasteful number, since it uses less digits than its factorization.

28725275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49990 (or 49985 counting only the distinct ones).

The product of its digits is 78400, while the sum is 38.

The square root of 28725275 is about 5359.5965333223. The cubic root of 28725275 is about 306.2584393065.

The spelling of 28725275 in words is "twenty-eight million, seven hundred twenty-five thousand, two hundred seventy-five".