78607993 has 2 divisors, whose sum is σ = 78607994. Its totient is φ = 78607992.

The previous prime is 78607981. The next prime is 78608003. The reversal of 78607993 is 39970687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70610409 + 7997584 = 8403^2 + 2828^2 .

It is a cyclic number.

It is not a de Polignac number, because 78607993 - 2⁵ = 78607961 is a prime.

It is not a weakly prime, because it can be changed into another prime (78607093) by changing a digit.

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 as a sum of consecutive naturals, namely, 39303996 + 39303997.

It is an arithmetic number, because the mean of its divisors is an integer number (39303997).

Almost surely, 2^78607993 is an apocalyptic number.

It is an amenable number.

78607993 is a deficient number, since it is larger than the sum of its proper divisors (1).

78607993 is an equidigital number, since it uses as much as digits as its factorization.

78607993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 78607993 is about 8866.1148763142. The cubic root of 78607993 is about 428.3731442488.

The spelling of 78607993 in words is "seventy-eight million, six hundred seven thousand, nine hundred ninety-three".