78857297 has 2 divisors, whose sum is σ = 78857298. Its totient is φ = 78857296.

The previous prime is 78857287. The next prime is 78857347. The reversal of 78857297 is 79275887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75186241 + 3671056 = 8671^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 78857297 - 2²⁰ = 77808721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78857257) 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, 39428648 + 39428649.

It is an arithmetic number, because the mean of its divisors is an integer number (39428649).

Almost surely, 2^78857297 is an apocalyptic number.

It is an amenable number.

78857297 is a deficient number, since it is larger than the sum of its proper divisors (1).

78857297 is an equidigital number, since it uses as much as digits as its factorization.

78857297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 53.

The square root of 78857297 is about 8880.1631178712. The cubic root of 78857297 is about 428.8255258837.

It can be divided in two parts, 788 and 57297, that added together give a palindrome (58085).

The spelling of 78857297 in words is "seventy-eight million, eight hundred fifty-seven thousand, two hundred ninety-seven".