8720668755 has 96 divisors (see below), whose sum is σ = 16446006720. Its totient is φ = 4258406400.

The previous prime is 8720668751. The next prime is 8720668769. The reversal of 8720668755 is 5578660278.

It is not a de Polignac number, because 8720668755 - 2² = 8720668751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8720668751) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4557679 + ... + 4559591.

It is an arithmetic number, because the mean of its divisors is an integer number (171312570).

Almost surely, 2^8720668755 is an apocalyptic number.

8720668755 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

8720668755 is a deficient number, since it is larger than the sum of its proper divisors (7725337965).

8720668755 is a wasteful number, since it uses less digits than its factorization.

8720668755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101 (or 2098 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The square root of 8720668755 is about 93384.5209603819. The cubic root of 8720668755 is about 2058.3375498538.

It can be divided in two parts, 87206 and 68755, that added together give a triangular number (155961 = T₅₅₈).

The spelling of 8720668755 in words is "eight billion, seven hundred twenty million, six hundred sixty-eight thousand, seven hundred fifty-five".