7686472721 has 4 divisors (see below), whose sum is σ = 7686649344. Its totient is φ = 7686296100.

The previous prime is 7686472699. The next prime is 7686472727. The reversal of 7686472721 is 1272746867.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7686472721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7686472721.

It is not an unprimeable number, because it can be changed into a prime (7686472727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28256 + ... + 127166.

It is an arithmetic number, because the mean of its divisors is an integer number (1921662336).

Almost surely, 2^7686472721 is an apocalyptic number.

It is an amenable number.

7686472721 is a deficient number, since it is larger than the sum of its proper divisors (176623).

7686472721 is an equidigital number, since it uses as much as digits as its factorization.

7686472721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176622.

The product of its digits is 1580544, while the sum is 50.

The square root of 7686472721 is about 87672.5311656964. The cubic root of 7686472721 is about 1973.5237782214.

The spelling of 7686472721 in words is "seven billion, six hundred eighty-six million, four hundred seventy-two thousand, seven hundred twenty-one".