28068139008 has 416 divisors, whose sum is σ = 102380947200. Its totient is φ = 7399931904.

The previous prime is 28068139007. The next prime is 28068139013. The reversal of 28068139008 is 80093186082.

It is a tau number, because it is divible by the number of its divisors (416).

It is a super-2 number, since 2×28068139008² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28068139007) 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, 10062478 + ... + 10065266.

Almost surely, 2^28068139008 is an apocalyptic number.

28068139008 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 28068139008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51190473600).

28068139008 is an abundant number, since it is smaller than the sum of its proper divisors (74312808192).

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

28068139008 is a wasteful number, since it uses less digits than its factorization.

28068139008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842 (or 2814 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 28068139008 in words is "twenty-eight billion, sixty-eight million, one hundred thirty-nine thousand, eight".