78317929844 has 48 divisors (see below), whose sum is σ = 171164036736. Its totient is φ = 30461952000.

The previous prime is 78317929843. The next prime is 78317929847. The reversal of 78317929844 is 44892971387.

It is a super-2 number, since 2×78317929844² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78317929843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31757 + ... + 397044.

It is an arithmetic number, because the mean of its divisors is an integer number (3565917432).

Almost surely, 2^78317929844 is an apocalyptic number.

It is an amenable number.

78317929844 is an abundant number, since it is smaller than the sum of its proper divisors (92846106892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78317929844 is a wasteful number, since it uses less digits than its factorization.

78317929844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429416 (or 429414 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 62.

The spelling of 78317929844 in words is "seventy-eight billion, three hundred seventeen million, nine hundred twenty-nine thousand, eight hundred forty-four".