4686736721 has 4 divisors (see below), whose sum is σ = 4688393892. Its totient is φ = 4685079552.

The previous prime is 4686736589. The next prime is 4686736727. The reversal of 4686736721 is 1276376864.

4686736721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3394693696 + 1292043025 = 58264^2 + 35945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4686736721 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 4686736721.

It is not an unprimeable number, because it can be changed into a prime (4686736727) 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, 824336 + ... + 830001.

It is an arithmetic number, because the mean of its divisors is an integer number (1172098473).

Almost surely, 2^4686736721 is an apocalyptic number.

It is an amenable number.

4686736721 is a deficient number, since it is larger than the sum of its proper divisors (1657171).

4686736721 is a wasteful number, since it uses less digits than its factorization.

4686736721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657170.

The product of its digits is 2032128, while the sum is 50.

The square root of 4686736721 is about 68459.7452595319. The cubic root of 4686736721 is about 1673.4915322100.

The spelling of 4686736721 in words is "four billion, six hundred eighty-six million, seven hundred thirty-six thousand, seven hundred twenty-one".