6720884361 has 15 divisors (see below), whose sum is σ = 10040941911. Its totient is φ = 4480097688.

The previous prime is 6720884311. The next prime is 6720884377. The reversal of 6720884361 is 1634880276.

The square root of 6720884361 is 81981.

It is a perfect power (a square), and thus also a powerful number.

6720884361 is a `hidden beast` number, since 6 + 7 + 208 + 8 + 436 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 757955961 + 5962928400 = 27531^2 + 77220^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6720884361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6720884311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 733275 + ... + 742383.

Almost surely, 2^6720884361 is an apocalyptic number.

6720884361 is the 81981-st square number.

6720884361 is the 40991-st centered octagonal number.

It is an amenable number.

6720884361 is a deficient number, since it is larger than the sum of its proper divisors (3320057550).

6720884361 is an frugal number, since it uses more digits than its factorization.

6720884361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18230 (or 9112 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The cubic root of 6720884361 is about 1887.1603691417.

The spelling of 6720884361 in words is "six billion, seven hundred twenty million, eight hundred eighty-four thousand, three hundred sixty-one".