6349921878 has 32 divisors (see below), whose sum is σ = 12768537600. Its totient is φ = 2105210016.

The previous prime is 6349921873. The next prime is 6349921901. The reversal of 6349921878 is 8781299436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6349921873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2713633 + ... + 2715971.

It is an arithmetic number, because the mean of its divisors is an integer number (399016800).

Almost surely, 2^6349921878 is an apocalyptic number.

6349921878 is an abundant number, since it is smaller than the sum of its proper divisors (6418615722).

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

6349921878 is a wasteful number, since it uses less digits than its factorization.

6349921878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4596.

The product of its digits is 5225472, while the sum is 57.

The square root of 6349921878 is about 79686.3970700144. The cubic root of 6349921878 is about 1851.7803050120.

The spelling of 6349921878 in words is "six billion, three hundred forty-nine million, nine hundred twenty-one thousand, eight hundred seventy-eight".