8128364720 has 40 divisors (see below), whose sum is σ = 21598227744. Its totient is φ = 2786867712.

The previous prime is 8128364701. The next prime is 8128364773. The reversal of 8128364720 is 274638218.

It is a tau number, because it is divible by the number of its divisors (40).

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, 7256909 + ... + 7258028.

Almost surely, 2^8128364720 is an apocalyptic number.

8128364720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8128364720 is an abundant number, since it is smaller than the sum of its proper divisors (13469863024).

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

8128364720 is a wasteful number, since it uses less digits than its factorization.

8128364720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14514957 (or 14514951 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 8128364720 is about 90157.4440631499. Note that the first 3 decimals coincide. The cubic root of 8128364720 is about 2010.6403510754.

The spelling of 8128364720 in words is "eight billion, one hundred twenty-eight million, three hundred sixty-four thousand, seven hundred twenty".