28118534388 has 24 divisors (see below), whose sum is σ = 74982758592. Its totient is φ = 8033866944.

The previous prime is 28118534363. The next prime is 28118534399. The reversal of 28118534388 is 88343581182.

It is a super-2 number, since 2×28118534388² (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 28118534388.

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, 167372145 + ... + 167372312.

It is an arithmetic number, because the mean of its divisors is an integer number (3124281608).

Almost surely, 2^28118534388 is an apocalyptic number.

28118534388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28118534388 is an abundant number, since it is smaller than the sum of its proper divisors (46864224204).

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

28118534388 is a wasteful number, since it uses less digits than its factorization.

28118534388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334744471 (or 334744469 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 51.

The spelling of 28118534388 in words is "twenty-eight billion, one hundred eighteen million, five hundred thirty-four thousand, three hundred eighty-eight".