6840391368 has 64 divisors (see below), whose sum is σ = 17358390720. Its totient is φ = 2246067200.

The previous prime is 6840391361. The next prime is 6840391387. The reversal of 6840391368 is 8631930486.

It is a super-2 number, since 2×6840391368² = 93581908134817822848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6840391361) 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, 422788 + ... + 438668.

It is an arithmetic number, because the mean of its divisors is an integer number (271224855).

Almost surely, 2^6840391368 is an apocalyptic number.

It is an amenable number.

6840391368 is an abundant number, since it is smaller than the sum of its proper divisors (10517999352).

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

6840391368 is a wasteful number, since it uses less digits than its factorization.

6840391368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16158 (or 16154 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 6840391368 is about 82706.6585469393. The cubic root of 6840391368 is about 1898.2801952017.

The spelling of 6840391368 in words is "six billion, eight hundred forty million, three hundred ninety-one thousand, three hundred sixty-eight".