28981755831 has 16 divisors (see below), whose sum is σ = 44485035264. Its totient is φ = 16440118464.

The previous prime is 28981755827. The next prime is 28981755833. The reversal of 28981755831 is 13855718982.

It is not a de Polignac number, because 28981755831 - 2² = 28981755827 is a prime.

It is a super-2 number, since 2×28981755831² (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 (28981755833) 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, 5033925 + ... + 5039678.

It is an arithmetic number, because the mean of its divisors is an integer number (2780314704).

Almost surely, 2^28981755831 is an apocalyptic number.

28981755831 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28981755831 is a deficient number, since it is larger than the sum of its proper divisors (15503279433).

28981755831 is a wasteful number, since it uses less digits than its factorization.

28981755831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10073750.

The product of its digits is 4838400, while the sum is 57.

The spelling of 28981755831 in words is "twenty-eight billion, nine hundred eighty-one million, seven hundred fifty-five thousand, eight hundred thirty-one".