28502225 has 12 divisors (see below), whose sum is σ = 35437836. Its totient is φ = 22740480.

The previous prime is 28502197. The next prime is 28502231. The reversal of 28502225 is 52220582.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7745089 + 20757136 = 2783^2 + 4556^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28502225 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28502194 and 28502203.

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 11 ways as a sum of consecutive naturals, for example, 9509 + ... + 12141.

It is an arithmetic number, because the mean of its divisors is an integer number (2953153).

Almost surely, 2^28502225 is an apocalyptic number.

28502225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28502225 is a deficient number, since it is larger than the sum of its proper divisors (6935611).

28502225 is a wasteful number, since it uses less digits than its factorization.

28502225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076 (or 3071 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 28502225 is about 5338.7475122916. The cubic root of 28502225 is about 305.4636860020.

The spelling of 28502225 in words is "twenty-eight million, five hundred two thousand, two hundred twenty-five".