77788117 has 6 divisors (see below), whose sum is σ = 85502774. Its totient is φ = 70716360.

The previous prime is 77788069. The next prime is 77788129. The reversal of 77788117 is 71188777.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 47416996 + 30371121 = 6886^2 + 5511^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77788117 is a prime.

It is a super-2 number, since 2×77788117² = 12101982292811378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77788157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 321318 + ... + 321559.

Almost surely, 2^77788117 is an apocalyptic number.

It is an amenable number.

77788117 is a deficient number, since it is larger than the sum of its proper divisors (7714657).

77788117 is a wasteful number, since it uses less digits than its factorization.

77788117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642899 (or 642888 counting only the distinct ones).

The product of its digits is 153664, while the sum is 46.

The square root of 77788117 is about 8819.7571962044. The cubic root of 77788117 is about 426.8786353852.

The spelling of 77788117 in words is "seventy-seven million, seven hundred eighty-eight thousand, one hundred seventeen".