8139692720 has 160 divisors (see below), whose sum is σ = 20409259200. Its totient is φ = 3009871872.

The previous prime is 8139692719. The next prime is 8139692747. The reversal of 8139692720 is 272969318.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12094304 + ... + 12094976.

It is an arithmetic number, because the mean of its divisors is an integer number (127557870).

Almost surely, 2^8139692720 is an apocalyptic number.

8139692720 is a gapful number since it is divisible by the number (80) 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 8139692720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10204629600).

8139692720 is an abundant number, since it is smaller than the sum of its proper divisors (12269566480).

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

8139692720 is a wasteful number, since it uses less digits than its factorization.

8139692720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 8139692720 is about 90220.2456214790. The cubic root of 8139692720 is about 2011.5739526101.

The spelling of 8139692720 in words is "eight billion, one hundred thirty-nine million, six hundred ninety-two thousand, seven hundred twenty".