6447762872 has 16 divisors (see below), whose sum is σ = 12101274240. Its totient is φ = 3220756416.

The previous prime is 6447762863. The next prime is 6447762883. The reversal of 6447762872 is 2782677446.

It is a congruent number.

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, 381848 + ... + 398375.

It is an arithmetic number, because the mean of its divisors is an integer number (756329640).

Almost surely, 2^6447762872 is an apocalyptic number.

It is an amenable number.

6447762872 is a deficient number, since it is larger than the sum of its proper divisors (5653511368).

6447762872 is a wasteful number, since it uses less digits than its factorization.

6447762872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781262 (or 781258 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 53.

The square root of 6447762872 is about 80297.9630625833. The cubic root of 6447762872 is about 1861.2427498532.

The spelling of 6447762872 in words is "six billion, four hundred forty-seven million, seven hundred sixty-two thousand, eight hundred seventy-two".