28597225 has 12 divisors (see below), whose sum is σ = 35743744. Its totient is φ = 22695120.

The previous prime is 28597207. The next prime is 28597237. The reversal of 28597225 is 52279582.

It is not a de Polignac number, because 28597225 - 2²¹ = 26500073 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, 1329 + ... + 7678.

Almost surely, 2^28597225 is an apocalyptic number.

28597225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28597225 is a deficient number, since it is larger than the sum of its proper divisors (7146519).

28597225 is a wasteful number, since it uses less digits than its factorization.

28597225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9144 (or 9139 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 28597225 is about 5347.6373287649. The cubic root of 28597225 is about 305.8026872421.

The spelling of 28597225 in words is "twenty-eight million, five hundred ninety-seven thousand, two hundred twenty-five".