78306793 has 2 divisors, whose sum is σ = 78306794. Its totient is φ = 78306792.

The previous prime is 78306791. The next prime is 78306817. The reversal of 78306793 is 39760387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73324969 + 4981824 = 8563^2 + 2232^2 .

It is an emirp because it is prime and its reverse (39760387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78306793 - 2¹ = 78306791 is a prime.

It is a super-2 number, since 2×78306793² = 12263907659889698, which contains 22 as substring.

Together with 78306791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78306791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39153396 + 39153397.

It is an arithmetic number, because the mean of its divisors is an integer number (39153397).

Almost surely, 2^78306793 is an apocalyptic number.

It is an amenable number.

78306793 is a deficient number, since it is larger than the sum of its proper divisors (1).

78306793 is an equidigital number, since it uses as much as digits as its factorization.

78306793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 78306793 is about 8849.1125543752. The cubic root of 78306793 is about 427.8253155744.

The spelling of 78306793 in words is "seventy-eight million, three hundred six thousand, seven hundred ninety-three".