78007393 has 2 divisors, whose sum is σ = 78007394. Its totient is φ = 78007392.

The previous prime is 78007367. The next prime is 78007409. The reversal of 78007393 is 39370087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73393489 + 4613904 = 8567^2 + 2148^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78007393 is a prime.

It is not a weakly prime, because it can be changed into another prime (78007313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39003696 + 39003697.

It is an arithmetic number, because the mean of its divisors is an integer number (39003697).

Almost surely, 2^78007393 is an apocalyptic number.

It is an amenable number.

78007393 is a deficient number, since it is larger than the sum of its proper divisors (1).

78007393 is an equidigital number, since it uses as much as digits as its factorization.

78007393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 78007393 is about 8832.1794026163. The cubic root of 78007393 is about 427.2793667885.

It can be divided in two parts, 78007 and 393, that added together give a square (78400 = 280²).

The spelling of 78007393 in words is "seventy-eight million, seven thousand, three hundred ninety-three".