6400634863 has 12 divisors (see below), whose sum is σ = 7575958000. Its totient is φ = 5297072256.

The previous prime is 6400634843. The next prime is 6400634939. The reversal of 6400634863 is 3684360046.

It is not a de Polignac number, because 6400634863 - 2⁵ = 6400634831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400634803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 537738 + ... + 549511.

Almost surely, 2^6400634863 is an apocalyptic number.

6400634863 is a deficient number, since it is larger than the sum of its proper divisors (1175323137).

6400634863 is a wasteful number, since it uses less digits than its factorization.

6400634863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087314 (or 1087285 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 6400634863 is about 80003.9677953538. The cubic root of 6400634863 is about 1856.6969225197.

The spelling of 6400634863 in words is "six billion, four hundred million, six hundred thirty-four thousand, eight hundred sixty-three".