28163025 has 48 divisors (see below), whose sum is σ = 56454720. Its totient is φ = 13651200.

The previous prime is 28163021. The next prime is 28163041. The reversal of 28163025 is 52036182.

28163025 is a `hidden beast` number, since 2 + 8 + 1 + 630 + 25 = 666.

It is not a de Polignac number, because 28163025 - 2² = 28163021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 28163025.

It is not an unprimeable number, because it can be changed into a prime (28163021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5529 + ... + 9321.

It is an arithmetic number, because the mean of its divisors is an integer number (1176140).

Almost surely, 2^28163025 is an apocalyptic number.

28163025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28163025 is an abundant number, since it is smaller than the sum of its proper divisors (28291695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28163025 is a wasteful number, since it uses less digits than its factorization.

28163025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823 (or 3812 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28163025 is about 5306.8846793576. The cubic root of 28163025 is about 304.2470903451.

The spelling of 28163025 in words is "twenty-eight million, one hundred sixty-three thousand, twenty-five".