6777777887 has 8 divisors (see below), whose sum is σ = 6792494400. Its totient is φ = 6763077504.

The previous prime is 6777777857. The next prime is 6777777913. The reversal of 6777777887 is 7887777776.

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 6777777887 - 2¹⁴ = 6777761503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6777777887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6777777857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1188539 + ... + 1194227.

It is an arithmetic number, because the mean of its divisors is an integer number (849061800).

Almost surely, 2^6777777887 is an apocalyptic number.

6777777887 is a deficient number, since it is larger than the sum of its proper divisors (14716513).

6777777887 is a wasteful number, since it uses less digits than its factorization.

6777777887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8065.

The product of its digits is 316240512, while the sum is 71.

The square root of 6777777887 is about 82327.2608981982. The cubic root of 6777777887 is about 1892.4704671140.

The spelling of 6777777887 in words is "six billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, eight hundred eighty-seven".