6778751987 has 8 divisors (see below), whose sum is σ = 7750361856. Its totient is φ = 5807946312.

The previous prime is 6778751971. The next prime is 6778752007. The reversal of 6778751987 is 7891578776.

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

It is not a de Polignac number, because 6778751987 - 2⁴ = 6778751971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6778750987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182873 + ... + 216794.

It is an arithmetic number, because the mean of its divisors is an integer number (968795232).

Almost surely, 2^6778751987 is an apocalyptic number.

6778751987 is a deficient number, since it is larger than the sum of its proper divisors (971609869).

6778751987 is a wasteful number, since it uses less digits than its factorization.

6778751987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402097.

The product of its digits is 41489280, while the sum is 65.

The square root of 6778751987 is about 82333.1767090278. The cubic root of 6778751987 is about 1892.5611245147.

The spelling of 6778751987 in words is "six billion, seven hundred seventy-eight million, seven hundred fifty-one thousand, nine hundred eighty-seven".