28111803231 has 16 divisors (see below), whose sum is σ = 38637679104. Its totient is φ = 18171018624.

The previous prime is 28111803179. The next prime is 28111803233. The reversal of 28111803231 is 13230811182.

It is not a de Polignac number, because 28111803231 - 2⁷ = 28111803103 is a prime.

It is a super-2 number, since 2×28111803231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111803233) 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, 916570 + ... + 946743.

It is an arithmetic number, because the mean of its divisors is an integer number (2414854944).

Almost surely, 2^28111803231 is an apocalyptic number.

28111803231 is a deficient number, since it is larger than the sum of its proper divisors (10525875873).

28111803231 is a wasteful number, since it uses less digits than its factorization.

28111803231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863470.

The product of its (nonzero) digits is 2304, while the sum is 30.

The spelling of 28111803231 in words is "twenty-eight billion, one hundred eleven million, eight hundred three thousand, two hundred thirty-one".