6642947288 has 32 divisors (see below), whose sum is σ = 12786586560. Its totient is φ = 3233925120.

The previous prime is 6642947261. The next prime is 6642947291. The reversal of 6642947288 is 8827492466.

It is a super-2 number, since 2×6642947288² = 88257497342293109888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26798 + ... + 118338.

It is an arithmetic number, because the mean of its divisors is an integer number (399580830).

Almost surely, 2^6642947288 is an apocalyptic number.

It is an amenable number.

6642947288 is a deficient number, since it is larger than the sum of its proper divisors (6143639272).

6642947288 is a wasteful number, since it uses less digits than its factorization.

6642947288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91787 (or 91783 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 56.

The square root of 6642947288 is about 81504.2777282272. The cubic root of 6642947288 is about 1879.8373263500.

The spelling of 6642947288 in words is "six billion, six hundred forty-two million, nine hundred forty-seven thousand, two hundred eighty-eight".