28112421708 has 288 divisors, whose sum is σ = 88803993600. Its totient is φ = 7658243712.

The previous prime is 28112421683. The next prime is 28112421763. The reversal of 28112421708 is 80712421182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12736741 + ... + 12738947.

It is an arithmetic number, because the mean of its divisors is an integer number (308347200).

Almost surely, 2^28112421708 is an apocalyptic number.

28112421708 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 28112421708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44401996800).

28112421708 is an abundant number, since it is smaller than the sum of its proper divisors (60691571892).

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

28112421708 is a wasteful number, since it uses less digits than its factorization.

28112421708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346 (or 2331 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The spelling of 28112421708 in words is "twenty-eight billion, one hundred twelve million, four hundred twenty-one thousand, seven hundred eight".