78571393 has 2 divisors, whose sum is σ = 78571394. Its totient is φ = 78571392.

The previous prime is 78571373. The next prime is 78571439. The reversal of 78571393 is 39317587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59413264 + 19158129 = 7708^2 + 4377^2 .

It is an emirp because it is prime and its reverse (39317587) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78571393 is a prime.

It is not a weakly prime, because it can be changed into another prime (78571343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39285696 + 39285697.

It is an arithmetic number, because the mean of its divisors is an integer number (39285697).

Almost surely, 2^78571393 is an apocalyptic number.

It is an amenable number.

78571393 is a deficient number, since it is larger than the sum of its proper divisors (1).

78571393 is an equidigital number, since it uses as much as digits as its factorization.

78571393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 43.

The square root of 78571393 is about 8864.0505977798. The cubic root of 78571393 is about 428.3066502006.

The spelling of 78571393 in words is "seventy-eight million, five hundred seventy-one thousand, three hundred ninety-three".