6781849638 has 16 divisors (see below), whose sum is σ = 13566331056. Its totient is φ = 2260177920.

The previous prime is 6781849597. The next prime is 6781849651. The reversal of 6781849638 is 8369481876.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75331 + ... + 138702.

It is an arithmetic number, because the mean of its divisors is an integer number (847895691).

Almost surely, 2^6781849638 is an apocalyptic number.

6781849638 is an abundant number, since it is smaller than the sum of its proper divisors (6784481418).

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

6781849638 is a wasteful number, since it uses less digits than its factorization.

6781849638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219319.

The product of its digits is 13934592, while the sum is 60.

The square root of 6781849638 is about 82351.9862419845. The cubic root of 6781849638 is about 1892.8493585491.

The spelling of 6781849638 in words is "six billion, seven hundred eighty-one million, eight hundred forty-nine thousand, six hundred thirty-eight".