28195225 has 6 divisors (see below), whose sum is σ = 34962110. Its totient is φ = 22556160.

The previous prime is 28195201. The next prime is 28195247. The reversal of 28195225 is 52259182.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 30976 + 28164249 = 176^2 + 5307^2 .

It is not a de Polignac number, because 28195225 - 2¹⁵ = 28162457 is a prime.

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, 563880 + ... + 563929.

Almost surely, 2^28195225 is an apocalyptic number.

28195225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28195225 is a deficient number, since it is larger than the sum of its proper divisors (6766885).

28195225 is a wasteful number, since it uses less digits than its factorization.

28195225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127819 (or 1127814 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 28195225 is about 5309.9176076470. The cubic root of 28195225 is about 304.3629991178.

The spelling of 28195225 in words is "twenty-eight million, one hundred ninety-five thousand, two hundred twenty-five".