6440878343 has 8 divisors (see below), whose sum is σ = 6842074800. Its totient is φ = 6045902208.

The previous prime is 6440878331. The next prime is 6440878361. The reversal of 6440878343 is 3438780446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440878343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440878363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1552946 + ... + 1557087.

It is an arithmetic number, because the mean of its divisors is an integer number (855259350).

Almost surely, 2^6440878343 is an apocalyptic number.

6440878343 is a deficient number, since it is larger than the sum of its proper divisors (401196457).

6440878343 is a wasteful number, since it uses less digits than its factorization.

6440878343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110161.

The product of its (nonzero) digits is 1548288, while the sum is 47.

The square root of 6440878343 is about 80255.0829729806. The cubic root of 6440878343 is about 1860.5800733436.

The spelling of 6440878343 in words is "six billion, four hundred forty million, eight hundred seventy-eight thousand, three hundred forty-three".