78317923749 has 32 divisors (see below), whose sum is σ = 113354674944. Its totient is φ = 47811202560.

The previous prime is 78317923727. The next prime is 78317923751. The reversal of 78317923749 is 94732971387.

It is a de Polignac number, because none of the positive numbers 2^k-78317923749 is a prime.

It is a super-2 number, since 2×78317923749² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78317923692 and 78317923701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78317913749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9522459 + ... + 9530679.

It is an arithmetic number, because the mean of its divisors is an integer number (3542333592).

Almost surely, 2^78317923749 is an apocalyptic number.

It is an amenable number.

78317923749 is a deficient number, since it is larger than the sum of its proper divisors (35036751195).

78317923749 is a wasteful number, since it uses less digits than its factorization.

78317923749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10157.

The product of its digits is 16003008, while the sum is 60.

The spelling of 78317923749 in words is "seventy-eight billion, three hundred seventeen million, nine hundred twenty-three thousand, seven hundred forty-nine".