28811731928 has 32 divisors (see below), whose sum is σ = 61744915200. Its totient is φ = 12346787232.

The previous prime is 28811731891. The next prime is 28811731943. The reversal of 28811731928 is 82913711882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103003 + ... + 1128821.

It is an arithmetic number, because the mean of its divisors is an integer number (1929528600).

Almost surely, 2^28811731928 is an apocalyptic number.

28811731928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28811731928 is an abundant number, since it is smaller than the sum of its proper divisors (32933183272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28811731928 is a wasteful number, since it uses less digits than its factorization.

28811731928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45759 (or 45755 counting only the distinct ones).

The product of its digits is 387072, while the sum is 50.

The spelling of 28811731928 in words is "twenty-eight billion, eight hundred eleven million, seven hundred thirty-one thousand, nine hundred twenty-eight".