6405308872 has 16 divisors (see below), whose sum is σ = 12334548060. Its totient is φ = 3116096064.

The previous prime is 6405308869. The next prime is 6405308873. The reversal of 6405308872 is 2788035046.

It can be written as a sum of positive squares in 2 ways, for example, as 5642112996 + 763195876 = 75114^2 + 27626^2 .

It is not an unprimeable number, because it can be changed into a prime (6405308873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10819483 + ... + 10820074.

Almost surely, 2^6405308872 is an apocalyptic number.

It is an amenable number.

6405308872 is a deficient number, since it is larger than the sum of its proper divisors (5929239188).

6405308872 is a wasteful number, since it uses less digits than its factorization.

6405308872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21639600 (or 21639596 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 6405308872 is about 80033.1735719633. The cubic root of 6405308872 is about 1857.1487582501.

The spelling of 6405308872 in words is "six billion, four hundred five million, three hundred eight thousand, eight hundred seventy-two".