8159728640 has 88 divisors (see below), whose sum is σ = 22370140032. Its totient is φ = 2797608960.

The previous prime is 8159728627. The next prime is 8159728651. The reversal of 8159728640 is 468279518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77996 + ... + 149675.

Almost surely, 2^8159728640 is an apocalyptic number.

8159728640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8159728640 is an abundant number, since it is smaller than the sum of its proper divisors (14210411392).

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

8159728640 is a wasteful number, since it uses less digits than its factorization.

8159728640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227703 (or 227685 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 8159728640 is about 90331.2163097564. The cubic root of 8159728640 is about 2013.2231021132.

The spelling of 8159728640 in words is "eight billion, one hundred fifty-nine million, seven hundred twenty-eight thousand, six hundred forty".