78286793 has 4 divisors (see below), whose sum is σ = 84308868. Its totient is φ = 72264720.

The previous prime is 78286763. The next prime is 78286807. The reversal of 78286793 is 39768287.

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 19963024 + 58323769 = 4468^2 + 7637^2 .

It is a cyclic number.

It is not a de Polignac number, because 78286793 - 2¹² = 78282697 is a prime.

It is a super-2 number, since 2×78286793² = 12257643916449698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78286763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3011018 + ... + 3011043.

It is an arithmetic number, because the mean of its divisors is an integer number (21077217).

Almost surely, 2^78286793 is an apocalyptic number.

It is an amenable number.

78286793 is a deficient number, since it is larger than the sum of its proper divisors (6022075).

78286793 is a wasteful number, since it uses less digits than its factorization.

78286793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022074.

The product of its digits is 1016064, while the sum is 50.

The square root of 78286793 is about 8847.9824253894. The cubic root of 78286793 is about 427.7888894673.

The spelling of 78286793 in words is "seventy-eight million, two hundred eighty-six thousand, seven hundred ninety-three".