28809025 has 12 divisors (see below), whose sum is σ = 40826752. Its totient is φ = 19754640.

The previous prime is 28809023. The next prime is 28809037. The reversal of 28809025 is 52090882.

It is not a de Polignac number, because 28809025 - 2¹ = 28809023 is a prime.

It is a hoax number, since the sum of its digits (34) 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 (28809023) 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, 82137 + ... + 82486.

Almost surely, 2^28809025 is an apocalyptic number.

28809025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28809025 is a deficient number, since it is larger than the sum of its proper divisors (12017727).

28809025 is a wasteful number, since it uses less digits than its factorization.

28809025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164640 (or 164635 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28809025 is about 5367.4039348646. The cubic root of 28809025 is about 306.5557878664. Note that the first 3 decimals are identical.

The spelling of 28809025 in words is "twenty-eight million, eight hundred nine thousand, twenty-five".