6720736868 has 24 divisors (see below), whose sum is σ = 11993696568. Its totient is φ = 3294077696.

The previous prime is 6720736861. The next prime is 6720736879. The reversal of 6720736868 is 8686370276.

It can be written as a sum of positive squares in 4 ways, for example, as 4086789184 + 2633947684 = 63928^2 + 51322^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (6720736861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239630 + ... + 266202.

It is an arithmetic number, because the mean of its divisors is an integer number (499737357).

Almost surely, 2^6720736868 is an apocalyptic number.

It is an amenable number.

6720736868 is a deficient number, since it is larger than the sum of its proper divisors (5272959700).

6720736868 is a wasteful number, since it uses less digits than its factorization.

6720736868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27823 (or 27821 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 53.

The square root of 6720736868 is about 81980.1004390700. The cubic root of 6720736868 is about 1887.1465641638.

The spelling of 6720736868 in words is "six billion, seven hundred twenty million, seven hundred thirty-six thousand, eight hundred sixty-eight".