6538738768 has 20 divisors (see below), whose sum is σ = 12671861940. Its totient is φ = 3268580864.

The previous prime is 6538738741. The next prime is 6538738771. The reversal of 6538738768 is 8678378356.

It can be written as a sum of positive squares in 2 ways, for example, as 2451438144 + 4087300624 = 49512^2 + 63932^2 .

It is a super-2 number, since 2×6538738768² = 85510209352292315648, 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 3 ways as a sum of consecutive naturals, for example, 22278 + ... + 116506.

It is an arithmetic number, because the mean of its divisors is an integer number (633593097).

Almost surely, 2^6538738768 is an apocalyptic number.

It is an amenable number.

6538738768 is a deficient number, since it is larger than the sum of its proper divisors (6133123172).

6538738768 is a wasteful number, since it uses less digits than its factorization.

6538738768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98574 (or 98568 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 61.

The square root of 6538738768 is about 80862.4682284680. The cubic root of 6538738768 is about 1869.9557471869.

The spelling of 6538738768 in words is "six billion, five hundred thirty-eight million, seven hundred thirty-eight thousand, seven hundred sixty-eight".