3978718765 has 8 divisors (see below), whose sum is σ = 5456528640. Its totient is φ = 2728264272.

The previous prime is 3978718747. The next prime is 3978718789. The reversal of 3978718765 is 5678178793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3978718765 - 2⁹ = 3978718253 is a prime.

It is a congruent number.

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, 56838805 + ... + 56838874.

It is an arithmetic number, because the mean of its divisors is an integer number (682066080).

Almost surely, 2^3978718765 is an apocalyptic number.

3978718765 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3978718765 is a deficient number, since it is larger than the sum of its proper divisors (1477809875).

3978718765 is a wasteful number, since it uses less digits than its factorization.

3978718765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113677691.

The product of its digits is 17781120, while the sum is 61.

The square root of 3978718765 is about 63077.0858949587. The cubic root of 3978718765 is about 1584.5808900932.

The spelling of 3978718765 in words is "three billion, nine hundred seventy-eight million, seven hundred eighteen thousand, seven hundred sixty-five".