78564793 has 2 divisors, whose sum is σ = 78564794. Its totient is φ = 78564792.

The previous prime is 78564781. The next prime is 78564809. The reversal of 78564793 is 39746587.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53042089 + 25522704 = 7283^2 + 5052^2 .

It is an emirp because it is prime and its reverse (39746587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78564793 - 2⁹ = 78564281 is a prime.

It is not a weakly prime, because it can be changed into another prime (78564763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39282396 + 39282397.

It is an arithmetic number, because the mean of its divisors is an integer number (39282397).

Almost surely, 2^78564793 is an apocalyptic number.

It is an amenable number.

78564793 is a deficient number, since it is larger than the sum of its proper divisors (1).

78564793 is an equidigital number, since it uses as much as digits as its factorization.

78564793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 49.

The square root of 78564793 is about 8863.6782996677. The cubic root of 78564793 is about 428.2946572732.

The spelling of 78564793 in words is "seventy-eight million, five hundred sixty-four thousand, seven hundred ninety-three".