677777779 has 8 divisors (see below), whose sum is σ = 775593728. Its totient is φ = 580209480.

The previous prime is 677777753. The next prime is 677777797. The reversal of 677777779 is 977777776.

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 677777779 - 2¹⁵ = 677745011 is a prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 677777779.

It is not an unprimeable number, because it can be changed into a prime (677777719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56007 + ... + 67024.

It is an arithmetic number, because the mean of its divisors is an integer number (96949216).

Almost surely, 2^677777779 is an apocalyptic number.

677777779 is a deficient number, since it is larger than the sum of its proper divisors (97815949).

677777779 is a wasteful number, since it uses less digits than its factorization.

677777779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123825.

The product of its digits is 44471322, while the sum is 64.

The square root of 677777779 is about 26034.1656098289. The cubic root of 677777779 is about 878.4069746194.

The spelling of 677777779 in words is "six hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-nine".