6387997836 has 48 divisors (see below), whose sum is σ = 16526942208. Its totient is φ = 1904020800.

The previous prime is 6387997831. The next prime is 6387997853.

It is a happy number.

6387997836 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (6387997831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388620 + ... + 404723.

It is an arithmetic number, because the mean of its divisors is an integer number (344311296).

Almost surely, 2^6387997836 is an apocalyptic number.

6387997836 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6387997836 is an abundant number, since it is smaller than the sum of its proper divisors (10138944372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6387997836 is a wasteful number, since it uses less digits than its factorization.

6387997836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793422 (or 793420 counting only the distinct ones).

The product of its digits is 82301184, while the sum is 66.

The square root of 6387997836 is about 79924.9512730536. The cubic root of 6387997836 is about 1855.4742007117.

The spelling of 6387997836 in words is "six billion, three hundred eighty-seven million, nine hundred ninety-seven thousand, eight hundred thirty-six".