28776293231 has 16 divisors (see below), whose sum is σ = 34669340160. Its totient is φ = 23332626720.

The previous prime is 28776293191. The next prime is 28776293239. The reversal of 28776293231 is 13239267782.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28776293231 - 2¹⁴ = 28776276847 is a prime.

It is a super-2 number, since 2×28776293231² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28776293231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28776293239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69755 + ... + 249836.

It is an arithmetic number, because the mean of its divisors is an integer number (2166833760).

Almost surely, 2^28776293231 is an apocalyptic number.

28776293231 is a deficient number, since it is larger than the sum of its proper divisors (5893046929).

28776293231 is a wasteful number, since it uses less digits than its factorization.

28776293231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320294.

The product of its digits is 1524096, while the sum is 50.

The spelling of 28776293231 in words is "twenty-eight billion, seven hundred seventy-six million, two hundred ninety-three thousand, two hundred thirty-one".