28518381880 has 32 divisors (see below), whose sum is σ = 64242914400. Its totient is φ = 11393742976.

The previous prime is 28518381863. The next prime is 28518381883. The reversal of 28518381880 is 8818381582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28518381883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391327 + ... + 458446.

It is an arithmetic number, because the mean of its divisors is an integer number (2007591075).

Almost surely, 2^28518381880 is an apocalyptic number.

28518381880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28518381880 is an abundant number, since it is smaller than the sum of its proper divisors (35724532520).

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

28518381880 is a wasteful number, since it uses less digits than its factorization.

28518381880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850623 (or 850619 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 52.

The spelling of 28518381880 in words is "twenty-eight billion, five hundred eighteen million, three hundred eighty-one thousand, eight hundred eighty".