78311785344 has 128 divisors (see below), whose sum is σ = 231243694080. Its totient is φ = 23318599680.

The previous prime is 78311785333. The next prime is 78311785369. The reversal of 78311785344 is 44358711387.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×78311785344² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 98272 + ... + 407775.

It is an arithmetic number, because the mean of its divisors is an integer number (1806591360).

Almost surely, 2^78311785344 is an apocalyptic number.

It is an amenable number.

78311785344 is an abundant number, since it is smaller than the sum of its proper divisors (152931908736).

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

78311785344 is a wasteful number, since it uses less digits than its factorization.

78311785344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506108 (or 506096 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The spelling of 78311785344 in words is "seventy-eight billion, three hundred eleven million, seven hundred eighty-five thousand, three hundred forty-four".