6487979740394 has 16 divisors (see below), whose sum is σ = 10304918470728. Its totient is φ = 3053024696832.

The previous prime is 6487979740391. The next prime is 6487979740453. The reversal of 6487979740394 is 4930479797846.

It can be written as a sum of positive squares in 4 ways, for example, as 4369717809769 + 2118261930625 = 2090387^2 + 1455425^2 .

It is a super-2 number, since 2×6487979740394² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6487979740391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3702659 + ... + 5165814.

Almost surely, 2^{6487979740394} is an apocalyptic number.

6487979740394 is a deficient number, since it is larger than the sum of its proper divisors (3816938730334).

6487979740394 is a wasteful number, since it uses less digits than its factorization.

6487979740394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8890009.

The product of its (nonzero) digits is 2304433152, while the sum is 77.

The spelling of 6487979740394 in words is "six trillion, four hundred eighty-seven billion, nine hundred seventy-nine million, seven hundred forty thousand, three hundred ninety-four".