8720086786 has 4 divisors (see below), whose sum is σ = 13080130182. Its totient is φ = 4360043392.

The previous prime is 8720086759. The next prime is 8720086789. The reversal of 8720086786 is 6876800278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8720011161 + 75625 = 93381^2 + 275^2 .

It is not an unprimeable number, because it can be changed into a prime (8720086789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2180021695 + ... + 2180021698.

Almost surely, 2^8720086786 is an apocalyptic number.

8720086786 is a deficient number, since it is larger than the sum of its proper divisors (4360043396).

8720086786 is a wasteful number, since it uses less digits than its factorization.

8720086786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360043395.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The square root of 8720086786 is about 93381.4049262486. The cubic root of 8720086786 is about 2058.2917614964.

The spelling of 8720086786 in words is "eight billion, seven hundred twenty million, eighty-six thousand, seven hundred eighty-six".