8720001705 has 32 divisors (see below), whose sum is σ = 14061535488. Its totient is φ = 4614278400.

The previous prime is 8720001679. The next prime is 8720001713. The reversal of 8720001705 is 5071000278.

It is a happy number.

It is not a de Polignac number, because 8720001705 - 2¹² = 8719997609 is a prime.

It is a super-3 number, since 3×8720001705³ (a number of 31 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1248132 + ... + 1255098.

It is an arithmetic number, because the mean of its divisors is an integer number (439422984).

Almost surely, 2^8720001705 is an apocalyptic number.

It is an amenable number.

8720001705 is a deficient number, since it is larger than the sum of its proper divisors (5341533783).

8720001705 is a wasteful number, since it uses less digits than its factorization.

8720001705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7617.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 8720001705 is about 93380.9493687015. The cubic root of 8720001705 is about 2058.2850672935.

The spelling of 8720001705 in words is "eight billion, seven hundred twenty million, one thousand, seven hundred five".