6403391868 has 24 divisors (see below), whose sum is σ = 15423224320. Its totient is φ = 2065610160.

The previous prime is 6403391867. The next prime is 6403391879. The reversal of 6403391868 is 8681933046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403391861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8606338 + ... + 8607081.

Almost surely, 2^6403391868 is an apocalyptic number.

It is an amenable number.

6403391868 is an abundant number, since it is smaller than the sum of its proper divisors (9019832452).

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

6403391868 is a wasteful number, since it uses less digits than its factorization.

6403391868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17213457 (or 17213455 counting only the distinct ones).

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

The square root of 6403391868 is about 80021.1963669627. The cubic root of 6403391868 is about 1856.9634683656.

The spelling of 6403391868 in words is "six billion, four hundred three million, three hundred ninety-one thousand, eight hundred sixty-eight".