28306825 has 12 divisors (see below), whose sum is σ = 35171980. Its totient is φ = 22599360.

The previous prime is 28306807. The next prime is 28306841. The reversal of 28306825 is 52860382.

It can be written as a sum of positive squares in 6 ways, for example, as 6702921 + 21603904 = 2589^2 + 4648^2 .

It is not a de Polignac number, because 28306825 - 2⁵ = 28306793 is a prime.

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, 16927 + ... + 18523.

Almost surely, 2^28306825 is an apocalyptic number.

28306825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28306825 is a deficient number, since it is larger than the sum of its proper divisors (6865155).

28306825 is a wasteful number, since it uses less digits than its factorization.

28306825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316 (or 2311 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28306825 is about 5320.4158672044. The cubic root of 28306825 is about 304.7640385845.

The spelling of 28306825 in words is "twenty-eight million, three hundred six thousand, eight hundred twenty-five".