28178433 has 12 divisors (see below), whose sum is σ = 40977300. Its totient is φ = 18658656.

The previous prime is 28178429. The next prime is 28178441. The reversal of 28178433 is 33487182.

It can be written as a sum of positive squares in 2 ways, for example, as 898704 + 27279729 = 948^2 + 5223^2 .

It is not a de Polignac number, because 28178433 - 2² = 28178429 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28178453) 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, 9166 + ... + 11847.

It is an arithmetic number, because the mean of its divisors is an integer number (3414775).

Almost surely, 2^28178433 is an apocalyptic number.

It is an amenable number.

28178433 is a deficient number, since it is larger than the sum of its proper divisors (12798867).

28178433 is a wasteful number, since it uses less digits than its factorization.

28178433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21168 (or 21165 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28178433 is about 5308.3361800097. The cubic root of 28178433 is about 304.3025647898.

The spelling of 28178433 in words is "twenty-eight million, one hundred seventy-eight thousand, four hundred thirty-three".