6388690987396 has 9 divisors (see below), whose sum is σ = 11180218074501. Its totient is φ = 3194342966112.

The previous prime is 6388690987379. The next prime is 6388690987397. The reversal of 6388690987396 is 6937890968836.

The square root of 6388690987396 is 2527586.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1059684948100 + 5329006039296 = 1029410^2 + 2308464^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6388690987397) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4423276 + ... + 5687068.

Almost surely, 2^{6388690987396} is an apocalyptic number.

6388690987396 is the 2527586-th square number.

It is an amenable number.

6388690987396 is a deficient number, since it is larger than the sum of its proper divisors (4791527087105).

6388690987396 is an frugal number, since it uses more digits than its factorization.

6388690987396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527590 (or 1263795 counting only the distinct ones).

The product of its (nonzero) digits is 5079158784, while the sum is 82.

The spelling of 6388690987396 in words is "six trillion, three hundred eighty-eight billion, six hundred ninety million, nine hundred eighty-seven thousand, three hundred ninety-six".