78547297 has 2 divisors, whose sum is σ = 78547298. Its totient is φ = 78547296.

The previous prime is 78547279. The next prime is 78547307. The reversal of 78547297 is 79274587.

Together with previous prime (78547279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68409441 + 10137856 = 8271^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 78547297 - 2¹⁵ = 78514529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78547297.

It is not a weakly prime, because it can be changed into another prime (78547237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39273648 + 39273649.

It is an arithmetic number, because the mean of its divisors is an integer number (39273649).

Almost surely, 2^78547297 is an apocalyptic number.

It is an amenable number.

78547297 is a deficient number, since it is larger than the sum of its proper divisors (1).

78547297 is an equidigital number, since it uses as much as digits as its factorization.

78547297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 78547297 is about 8862.6912955377. The cubic root of 78547297 is about 428.2628618622.

It can be divided in two parts, 7854 and 7297, that added together give a palindrome (15151).

The spelling of 78547297 in words is "seventy-eight million, five hundred forty-seven thousand, two hundred ninety-seven".