78799993 has 2 divisors, whose sum is σ = 78799994. Its totient is φ = 78799992.

The previous prime is 78799969. The next prime is 78799997. The reversal of 78799993 is 39999787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68508729 + 10291264 = 8277^2 + 3208^2 .

It is a cyclic number.

It is not a de Polignac number, because 78799993 - 2⁹ = 78799481 is a prime.

It is not a weakly prime, because it can be changed into another prime (78799997) 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, 39399996 + 39399997.

It is an arithmetic number, because the mean of its divisors is an integer number (39399997).

Almost surely, 2^78799993 is an apocalyptic number.

It is an amenable number.

78799993 is a deficient number, since it is larger than the sum of its proper divisors (1).

78799993 is an equidigital number, since it uses as much as digits as its factorization.

78799993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7715736, while the sum is 61.

The square root of 78799993 is about 8876.9360141887. The cubic root of 78799993 is about 428.7216277723.

The spelling of 78799993 in words is "seventy-eight million, seven hundred ninety-nine thousand, nine hundred ninety-three".