28107971808 has 192 divisors, whose sum is σ = 89169776640. Its totient is φ = 7582003200.

The previous prime is 28107971807. The next prime is 28107971911. The reversal of 28107971808 is 80817970182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28107971807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 837658 + ... + 870566.

It is an arithmetic number, because the mean of its divisors is an integer number (464425920).

Almost surely, 2^28107971808 is an apocalyptic number.

28107971808 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 28107971808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44584888320).

28107971808 is an abundant number, since it is smaller than the sum of its proper divisors (61061804832).

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

28107971808 is a wasteful number, since it uses less digits than its factorization.

28107971808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33001 (or 32993 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 28107971808 in words is "twenty-eight billion, one hundred seven million, nine hundred seventy-one thousand, eight hundred eight".