78839357 has 2 divisors, whose sum is σ = 78839358. Its totient is φ = 78839356.

The previous prime is 78839347. The next prime is 78839363. The reversal of 78839357 is 75393887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59382436 + 19456921 = 7706^2 + 4411^2 .

It is a cyclic number.

It is not a de Polignac number, because 78839357 - 2¹⁴ = 78822973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78839317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39419678 + 39419679.

It is an arithmetic number, because the mean of its divisors is an integer number (39419679).

Almost surely, 2^78839357 is an apocalyptic number.

It is an amenable number.

78839357 is a deficient number, since it is larger than the sum of its proper divisors (1).

78839357 is an equidigital number, since it uses as much as digits as its factorization.

78839357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 50.

The square root of 78839357 is about 8879.1529438342. The cubic root of 78839357 is about 428.7930042118.

The spelling of 78839357 in words is "seventy-eight million, eight hundred thirty-nine thousand, three hundred fifty-seven".