28613225 has 6 divisors (see below), whose sum is σ = 35480430. Its totient is φ = 22890560.

The previous prime is 28613201. The next prime is 28613237. The reversal of 28613225 is 52231682.

It can be written as a sum of positive squares in 3 ways, for example, as 5216656 + 23396569 = 2284^2 + 4837^2 .

It is not a de Polignac number, because 28613225 - 2⁶ = 28613161 is a prime.

It is a Curzon number.

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 5 ways as a sum of consecutive naturals, for example, 572240 + ... + 572289.

It is an arithmetic number, because the mean of its divisors is an integer number (5913405).

Almost surely, 2^28613225 is an apocalyptic number.

28613225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28613225 is a deficient number, since it is larger than the sum of its proper divisors (6867205).

28613225 is a wasteful number, since it uses less digits than its factorization.

28613225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144539 (or 1144534 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 28613225 is about 5349.1331073362. The cubic root of 28613225 is about 305.8597082849.

The spelling of 28613225 in words is "twenty-eight million, six hundred thirteen thousand, two hundred twenty-five".