6819381887 has 8 divisors (see below), whose sum is σ = 7288005456. Its totient is φ = 6358256512.

The previous prime is 6819381869. The next prime is 6819381901. The reversal of 6819381887 is 7881839186.

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

It is a cyclic number.

It is not a de Polignac number, because 6819381887 - 2¹⁴ = 6819365503 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 (6819381817) 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, 1872668 + ... + 1876305.

It is an arithmetic number, because the mean of its divisors is an integer number (911000682).

Almost surely, 2^6819381887 is an apocalyptic number.

6819381887 is a deficient number, since it is larger than the sum of its proper divisors (468623569).

6819381887 is a wasteful number, since it uses less digits than its factorization.

6819381887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749097.

The product of its digits is 4644864, while the sum is 59.

The square root of 6819381887 is about 82579.5488423133. The cubic root of 6819381887 is about 1896.3347518178.

The spelling of 6819381887 in words is "six billion, eight hundred nineteen million, three hundred eighty-one thousand, eight hundred eighty-seven".