778999967 has 2 divisors, whose sum is σ = 778999968. Its totient is φ = 778999966.

The previous prime is 778999957. The next prime is 778999999. The reversal of 778999967 is 769999877.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 778999967 - 2¹⁰ = 778998943 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 778999967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778999937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389499983 + 389499984.

It is an arithmetic number, because the mean of its divisors is an integer number (389499984).

Almost surely, 2^778999967 is an apocalyptic number.

778999967 is a deficient number, since it is larger than the sum of its proper divisors (1).

778999967 is an equidigital number, since it uses as much as digits as its factorization.

778999967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108020304, while the sum is 71.

The square root of 778999967 is about 27910.5708827319. The cubic root of 778999967 is about 920.1228439461.

The spelling of 778999967 in words is "seven hundred seventy-eight million, nine hundred ninety-nine thousand, nine hundred sixty-seven".