28283225 has 6 divisors (see below), whose sum is σ = 35071230. Its totient is φ = 22626560.

The previous prime is 28283209. The next prime is 28283231. The reversal of 28283225 is 52238282.

It can be written as a sum of positive squares in 3 ways, for example, as 4963984 + 23319241 = 2228^2 + 4829^2 .

It is not a de Polignac number, because 28283225 - 2⁴ = 28283209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28283191 and 28283200.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565640 + ... + 565689.

It is an arithmetic number, because the mean of its divisors is an integer number (5845205).

Almost surely, 2^28283225 is an apocalyptic number.

28283225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28283225 is a deficient number, since it is larger than the sum of its proper divisors (6788005).

28283225 is a wasteful number, since it uses less digits than its factorization.

28283225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131339 (or 1131334 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 28283225 is about 5318.1975329993. The cubic root of 28283225 is about 304.6793189563.

The spelling of 28283225 in words is "twenty-eight million, two hundred eighty-three thousand, two hundred twenty-five".