8179720128 has 84 divisors (see below), whose sum is σ = 23677994808. Its totient is φ = 2699558400.

The previous prime is 8179720127. The next prime is 8179720147. The reversal of 8179720128 is 8210279718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8179720121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12126 + ... + 128477.

Almost surely, 2^8179720128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8179720128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11838997404).

8179720128 is an abundant number, since it is smaller than the sum of its proper divisors (15498274680).

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

8179720128 is a wasteful number, since it uses less digits than its factorization.

8179720128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140722 (or 140709 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 8179720128 is about 90441.8052009136. The cubic root of 8179720128 is about 2014.8659059786.

The spelling of 8179720128 in words is "eight billion, one hundred seventy-nine million, seven hundred twenty thousand, one hundred twenty-eight".