6647840872 has 16 divisors (see below), whose sum is σ = 12468234240. Its totient is φ = 3322978416.

The previous prime is 6647840869. The next prime is 6647840891. The reversal of 6647840872 is 2780487466.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87298 + ... + 144625.

It is an arithmetic number, because the mean of its divisors is an integer number (779264640).

Almost surely, 2^6647840872 is an apocalyptic number.

It is an amenable number.

6647840872 is a deficient number, since it is larger than the sum of its proper divisors (5820393368).

6647840872 is a wasteful number, since it uses less digits than its factorization.

6647840872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235512 (or 235508 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 52.

The square root of 6647840872 is about 81534.2926135991. The cubic root of 6647840872 is about 1880.2988124702.

The spelling of 6647840872 in words is "six billion, six hundred forty-seven million, eight hundred forty thousand, eight hundred seventy-two".