78077317 has 2 divisors, whose sum is σ = 78077318. Its totient is φ = 78077316.

The previous prime is 78077303. The next prime is 78077323. The reversal of 78077317 is 71377087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76020961 + 2056356 = 8719^2 + 1434^2 .

It is an emirp because it is prime and its reverse (71377087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78077317 - 2¹⁹ = 77553029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78077317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78071317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39038658 + 39038659.

It is an arithmetic number, because the mean of its divisors is an integer number (39038659).

Almost surely, 2^78077317 is an apocalyptic number.

It is an amenable number.

78077317 is a deficient number, since it is larger than the sum of its proper divisors (1).

78077317 is an equidigital number, since it uses as much as digits as its factorization.

78077317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57624, while the sum is 40.

The square root of 78077317 is about 8836.1369953164. The cubic root of 78077317 is about 427.4069964002.

The spelling of 78077317 in words is "seventy-eight million, seventy-seven thousand, three hundred seventeen".