77731317 has 12 divisors (see below), whose sum is σ = 113391564. Its totient is φ = 51307200.

The previous prime is 77731309. The next prime is 77731321. The reversal of 77731317 is 71313777.

It can be written as a sum of positive squares in 2 ways, for example, as 59120721 + 18610596 = 7689^2 + 4314^2 .

It is not a de Polignac number, because 77731317 - 2³ = 77731309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77731307) 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 11 ways as a sum of consecutive naturals, for example, 41848 + ... + 43665.

It is an arithmetic number, because the mean of its divisors is an integer number (9449297).

Almost surely, 2^77731317 is an apocalyptic number.

It is an amenable number.

77731317 is a deficient number, since it is larger than the sum of its proper divisors (35660247).

77731317 is a wasteful number, since it uses less digits than its factorization.

77731317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85620 (or 85617 counting only the distinct ones).

The product of its digits is 21609, while the sum is 36.

The square root of 77731317 is about 8816.5365648876. The cubic root of 77731317 is about 426.7747094414.

The spelling of 77731317 in words is "seventy-seven million, seven hundred thirty-one thousand, three hundred seventeen".