28847225 has 24 divisors (see below), whose sum is σ = 41083680. Its totient is φ = 19872000.

The previous prime is 28847219. The next prime is 28847243. The reversal of 28847225 is 52274882.

It is a happy number.

It is not a de Polignac number, because 28847225 - 2⁸ = 28846969 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2465 + ... + 7985.

It is an arithmetic number, because the mean of its divisors is an integer number (1711820).

Almost surely, 2^28847225 is an apocalyptic number.

28847225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28847225 is a deficient number, since it is larger than the sum of its proper divisors (12236455).

28847225 is a wasteful number, since it uses less digits than its factorization.

28847225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561 (or 5556 counting only the distinct ones).

The product of its digits is 71680, while the sum is 38.

The square root of 28847225 is about 5370.9612733662. The cubic root of 28847225 is about 306.6912229601.

The spelling of 28847225 in words is "twenty-eight million, eight hundred forty-seven thousand, two hundred twenty-five".