28828025 has 12 divisors (see below), whose sum is σ = 36422892. Its totient is φ = 22626240.

The previous prime is 28828021. The next prime is 28828031. The reversal of 28828025 is 52082882.

It can be written as a sum of positive squares in 6 ways, for example, as 1401856 + 27426169 = 1184^2 + 5237^2 .

It is not a de Polignac number, because 28828025 - 2² = 28828021 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28828021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9554 + ... + 12203.

It is an arithmetic number, because the mean of its divisors is an integer number (3035241).

Almost surely, 2^28828025 is an apocalyptic number.

28828025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28828025 is a deficient number, since it is larger than the sum of its proper divisors (7594867).

28828025 is a wasteful number, since it uses less digits than its factorization.

28828025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21820 (or 21815 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 28828025 is about 5369.1735863166. The cubic root of 28828025 is about 306.6231658261.

The spelling of 28828025 in words is "twenty-eight million, eight hundred twenty-eight thousand, twenty-five".