28140205688 has 64 divisors (see below), whose sum is σ = 61592856000. Its totient is φ = 12047978880.

The previous prime is 28140205679. The next prime is 28140205693. The reversal of 28140205688 is 88650204182.

It is a congruent number.

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, 3060458 + ... + 3069638.

It is an arithmetic number, because the mean of its divisors is an integer number (962388375).

Almost surely, 2^28140205688 is an apocalyptic number.

28140205688 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 28140205688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30796428000).

28140205688 is an abundant number, since it is smaller than the sum of its proper divisors (33452650312).

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

28140205688 is a wasteful number, since it uses less digits than its factorization.

28140205688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10325 (or 10307 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 28140205688 in words is "twenty-eight billion, one hundred forty million, two hundred five thousand, six hundred eighty-eight".