28811025 has 24 divisors (see below), whose sum is σ = 52928160. Its totient is φ = 15365520.

The previous prime is 28811023. The next prime is 28811033. The reversal of 28811025 is 52011882.

It is not a de Polignac number, because 28811025 - 2¹ = 28811023 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28811025.

It is not an unprimeable number, because it can be changed into a prime (28811023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20667 + ... + 22016.

It is an arithmetic number, because the mean of its divisors is an integer number (2205340).

Almost surely, 2^28811025 is an apocalyptic number.

28811025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28811025 is a deficient number, since it is larger than the sum of its proper divisors (24117135).

28811025 is a wasteful number, since it uses less digits than its factorization.

28811025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42702 (or 42691 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 28811025 is about 5367.5902414398. The cubic root of 28811025 is about 306.5628816780.

The spelling of 28811025 in words is "twenty-eight million, eight hundred eleven thousand, twenty-five".