78342793 has 2 divisors, whose sum is σ = 78342794. Its totient is φ = 78342792.

The previous prime is 78342791. The next prime is 78342821. The reversal of 78342793 is 39724387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74857104 + 3485689 = 8652^2 + 1867^2 .

It is a cyclic number.

It is not a de Polignac number, because 78342793 - 2¹ = 78342791 is a prime.

It is a super-2 number, since 2×78342793² = 12275186430081698, which contains 22 as substring.

Together with 78342791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78342791) 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 as a sum of consecutive naturals, namely, 39171396 + 39171397.

It is an arithmetic number, because the mean of its divisors is an integer number (39171397).

Almost surely, 2^78342793 is an apocalyptic number.

It is an amenable number.

78342793 is a deficient number, since it is larger than the sum of its proper divisors (1).

78342793 is an equidigital number, since it uses as much as digits as its factorization.

78342793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The square root of 78342793 is about 8851.1464229217. The cubic root of 78342793 is about 427.8908669404.

The spelling of 78342793 in words is "seventy-eight million, three hundred forty-two thousand, seven hundred ninety-three".