28188823 has 12 divisors (see below), whose sum is σ = 31742200. Its totient is φ = 24883056.

The previous prime is 28188803. The next prime is 28188833. The reversal of 28188823 is 32888182.

It is not a de Polignac number, because 28188823 - 2⁵ = 28188791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28188803) 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, 4828 + ... + 8926.

Almost surely, 2^28188823 is an apocalyptic number.

28188823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28188823 is a deficient number, since it is larger than the sum of its proper divisors (3553377).

28188823 is a wasteful number, since it uses less digits than its factorization.

28188823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158 (or 4135 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 28188823 is about 5309.3147392107. The cubic root of 28188823 is about 304.3399611813.

The spelling of 28188823 in words is "twenty-eight million, one hundred eighty-eight thousand, eight hundred twenty-three".