78345793 has 4 divisors (see below), whose sum is σ = 80256708. Its totient is φ = 76434880.

The previous prime is 78345781. The next prime is 78345803. The reversal of 78345793 is 39754387.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8573184 + 69772609 = 2928^2 + 8353^2 .

It is a cyclic number.

It is not a de Polignac number, because 78345793 - 2¹³ = 78337601 is a prime.

It is a super-2 number, since 2×78345793² = 12276126561597698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78345763) 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 3 ways as a sum of consecutive naturals, for example, 955396 + ... + 955477.

It is an arithmetic number, because the mean of its divisors is an integer number (20064177).

Almost surely, 2^78345793 is an apocalyptic number.

It is an amenable number.

78345793 is a deficient number, since it is larger than the sum of its proper divisors (1910915).

78345793 is a wasteful number, since it uses less digits than its factorization.

78345793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910914.

The product of its digits is 635040, while the sum is 46.

The square root of 78345793 is about 8851.3158908718. The cubic root of 78345793 is about 427.8963286477.

The spelling of 78345793 in words is "seventy-eight million, three hundred forty-five thousand, seven hundred ninety-three".