28108113768 has 96 divisors (see below), whose sum is σ = 87162965760. Its totient is φ = 8015967360.

The previous prime is 28108113763. The next prime is 28108113779. The reversal of 28108113768 is 86731180182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28108113763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221121 + ... + 324207.

It is an arithmetic number, because the mean of its divisors is an integer number (907947560).

Almost surely, 2^28108113768 is an apocalyptic number.

28108113768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28108113768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43581482880).

28108113768 is an abundant number, since it is smaller than the sum of its proper divisors (59054851992).

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

28108113768 is a wasteful number, since it uses less digits than its factorization.

28108113768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103647 (or 103640 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

It can be divided in two parts, 281081 and 13768, that added together give a square (294849 = 543²).

The spelling of 28108113768 in words is "twenty-eight billion, one hundred eight million, one hundred thirteen thousand, seven hundred sixty-eight".