6399764847 has 24 divisors (see below), whose sum is σ = 10596643200. Its totient is φ = 3645948240.

The previous prime is 6399764827. The next prime is 6399764897. The reversal of 6399764847 is 7484679936.

6399764847 is a `hidden beast` number, since 63 + 9 + 97 + 6 + 484 + 7 = 666.

6399764847 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6399764847 - 2⁶ = 6399764783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399764827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132597 + ... + 174302.

It is an arithmetic number, because the mean of its divisors is an integer number (441526800).

Almost surely, 2^6399764847 is an apocalyptic number.

6399764847 is a deficient number, since it is larger than the sum of its proper divisors (4196878353).

6399764847 is a wasteful number, since it uses less digits than its factorization.

6399764847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307243 (or 307240 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 63.

The square root of 6399764847 is about 79998.5302802495. The cubic root of 6399764847 is about 1856.6127939262.

The spelling of 6399764847 in words is "six billion, three hundred ninety-nine million, seven hundred sixty-four thousand, eight hundred forty-seven".