768821667 has 16 divisors (see below), whose sum is σ = 1071221760. Its totient is φ = 489549632.

The previous prime is 768821663. The next prime is 768821687. The reversal of 768821667 is 766128867.

It is a cyclic number.

It is not a de Polignac number, because 768821667 - 2² = 768821663 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (768821663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41863 + ... + 57359.

It is an arithmetic number, because the mean of its divisors is an integer number (66951360).

Almost surely, 2^768821667 is an apocalyptic number.

768821667 is a deficient number, since it is larger than the sum of its proper divisors (302400093).

768821667 is a wasteful number, since it uses less digits than its factorization.

768821667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16242.

The product of its digits is 1354752, while the sum is 51.

The square root of 768821667 is about 27727.6336350580. The cubic root of 768821667 is about 916.0978658077.

The spelling of 768821667 in words is "seven hundred sixty-eight million, eight hundred twenty-one thousand, six hundred sixty-seven".