6647642772 has 24 divisors (see below), whose sum is σ = 15513001056. Its totient is φ = 2215618848.

The previous prime is 6647642767. The next prime is 6647642773. The reversal of 6647642772 is 2772467466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647642773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91903 + ... + 147449.

It is an arithmetic number, because the mean of its divisors is an integer number (646375044).

Almost surely, 2^6647642772 is an apocalyptic number.

It is an amenable number.

6647642772 is an abundant number, since it is smaller than the sum of its proper divisors (8865358284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6647642772 is a wasteful number, since it uses less digits than its factorization.

6647642772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65527 (or 65525 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 51.

The square root of 6647642772 is about 81533.0777782858. The cubic root of 6647642772 is about 1880.2801351832.

The spelling of 6647642772 in words is "six billion, six hundred forty-seven million, six hundred forty-two thousand, seven hundred seventy-two".