6391997306 has 16 divisors (see below), whose sum is σ = 9644963328. Its totient is φ = 3177066000.

The previous prime is 6391997281. The next prime is 6391997317. The reversal of 6391997306 is 6037991936.

It is a happy number.

It is a super-2 number, since 2×6391997306² = 81715259119822515272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218231 + ... + 245781.

It is an arithmetic number, because the mean of its divisors is an integer number (602810208).

Almost surely, 2^6391997306 is an apocalyptic number.

6391997306 is a deficient number, since it is larger than the sum of its proper divisors (3252966022).

6391997306 is a wasteful number, since it uses less digits than its factorization.

6391997306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28237.

The product of its (nonzero) digits is 1653372, while the sum is 53.

The square root of 6391997306 is about 79949.9675171917. The cubic root of 6391997306 is about 1855.8613520231.

The spelling of 6391997306 in words is "six billion, three hundred ninety-one million, nine hundred ninety-seven thousand, three hundred six".