6388666272 has 72 divisors (see below), whose sum is σ = 18658821636. Its totient is φ = 2071996416.

The previous prime is 6388666259. The next prime is 6388666303. The reversal of 6388666272 is 2726668836.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6228997776 + 159668496 = 78924^2 + 12636^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289113 + ... + 310424.

Almost surely, 2^6388666272 is an apocalyptic number.

It is an amenable number.

6388666272 is an abundant number, since it is smaller than the sum of its proper divisors (12270155364).

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

6388666272 is a wasteful number, since it uses less digits than its factorization.

6388666272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599590 (or 599579 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 6388666272 is about 79929.1328115100. The cubic root of 6388666272 is about 1855.5389169983.

The spelling of 6388666272 in words is "six billion, three hundred eighty-eight million, six hundred sixty-six thousand, two hundred seventy-two".