867996779 has 16 divisors (see below), whose sum is σ = 996441600. Its totient is φ = 749432736.

The previous prime is 867996769. The next prime is 867996781. The reversal of 867996779 is 977699768.

It is not a de Polignac number, because 867996779 - 2⁴ = 867996763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (867996719) 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 15 ways as a sum of consecutive naturals, for example, 2729 + ... + 41754.

It is an arithmetic number, because the mean of its divisors is an integer number (62277600).

Almost surely, 2^867996779 is an apocalyptic number.

867996779 is a deficient number, since it is larger than the sum of its proper divisors (128444821).

867996779 is a wasteful number, since it uses less digits than its factorization.

867996779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44594.

The product of its digits is 72013536, while the sum is 68.

The square root of 867996779 is about 29461.7850613299. The cubic root of 867996779 is about 953.9070046199.

The spelling of 867996779 in words is "eight hundred sixty-seven million, nine hundred ninety-six thousand, seven hundred seventy-nine".