117777779 has 8 divisors (see below), whose sum is σ = 140455680. Its totient is φ = 96563016.

The previous prime is 117777767. The next prime is 117777791. The reversal of 117777779 is 977777711.

It is an interprime number because it is at equal distance from previous prime (117777767) and next prime (117777791).

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

It is not a de Polignac number, because 117777779 - 2²⁰ = 116729203 is a prime.

It is a Duffinian number.

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 117777779.

It is not an unprimeable number, because it can be changed into a prime (117777739) 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, 365609 + ... + 365930.

It is an arithmetic number, because the mean of its divisors is an integer number (17556960).

Almost surely, 2^117777779 is an apocalyptic number.

117777779 is a deficient number, since it is larger than the sum of its proper divisors (22677901).

117777779 is an equidigital number, since it uses as much as digits as its factorization.

117777779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731569.

The product of its digits is 1058841, while the sum is 53.

The square root of 117777779 is about 10852.5471203769. The cubic root of 117777779 is about 490.1787200350.

The spelling of 117777779 in words is "one hundred seventeen million, seven hundred seventy-seven thousand, seven hundred seventy-nine".