28432823 has 4 divisors (see below), whose sum is σ = 30105360. Its totient is φ = 26760288.

The previous prime is 28432819. The next prime is 28432879. The reversal of 28432823 is 32823482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28432823 - 2² = 28432819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28432823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28432123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836243 + ... + 836276.

It is an arithmetic number, because the mean of its divisors is an integer number (7526340).

Almost surely, 2^28432823 is an apocalyptic number.

28432823 is a deficient number, since it is larger than the sum of its proper divisors (1672537).

28432823 is a wasteful number, since it uses less digits than its factorization.

28432823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672536.

The product of its digits is 18432, while the sum is 32.

The square root of 28432823 is about 5332.2437116096. The cubic root of 28432823 is about 305.2155530815.

The spelling of 28432823 in words is "twenty-eight million, four hundred thirty-two thousand, eight hundred twenty-three".