28231655823 has 24 divisors (see below), whose sum is σ = 46645178528. Its totient is φ = 16118341632.

The previous prime is 28231655797. The next prime is 28231655827. The reversal of 28231655823 is 32855613282.

28231655823 is a `hidden beast` number, since 2 + 8 + 2 + 3 + 1 + 65 + 582 + 3 = 666.

It is not a de Polignac number, because 28231655823 - 2⁵ = 28231655791 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 (28231655827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121690 + ... + 266967.

Almost surely, 2^28231655823 is an apocalyptic number.

28231655823 is a deficient number, since it is larger than the sum of its proper divisors (18413522705).

28231655823 is a wasteful number, since it uses less digits than its factorization.

28231655823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389823 (or 389820 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 28231655823 in words is "twenty-eight billion, two hundred thirty-one million, six hundred fifty-five thousand, eight hundred twenty-three".