28791538860 has 48 divisors (see below), whose sum is σ = 92132925696. Its totient is φ = 6580923072.

The previous prime is 28791538829. The next prime is 28791538873. The reversal of 28791538860 is 6883519782.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28791538860.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34275222 + ... + 34276061.

It is an arithmetic number, because the mean of its divisors is an integer number (1919435952).

Almost surely, 2^28791538860 is an apocalyptic number.

28791538860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28791538860 is an abundant number, since it is smaller than the sum of its proper divisors (63341386836).

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

28791538860 is a wasteful number, since it uses less digits than its factorization.

28791538860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68551302 (or 68551300 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 57.

The spelling of 28791538860 in words is "twenty-eight billion, seven hundred ninety-one million, five hundred thirty-eight thousand, eight hundred sixty".