6445445878 has 8 divisors (see below), whose sum is σ = 9668510640. Its totient is φ = 3222609000.

The previous prime is 6445445869. The next prime is 6445445891. The reversal of 6445445878 is 8785445446.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73503 + ... + 135253.

It is an arithmetic number, because the mean of its divisors is an integer number (1208563830).

Almost surely, 2^6445445878 is an apocalyptic number.

6445445878 is a deficient number, since it is larger than the sum of its proper divisors (3223064762).

6445445878 is a wasteful number, since it uses less digits than its factorization.

6445445878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113942.

The product of its digits is 17203200, while the sum is 55.

The square root of 6445445878 is about 80283.5342894170. The cubic root of 6445445878 is about 1861.0197782048.

The spelling of 6445445878 in words is "six billion, four hundred forty-five million, four hundred forty-five thousand, eight hundred seventy-eight".