78643597 has 2 divisors, whose sum is σ = 78643598. Its totient is φ = 78643596.

The previous prime is 78643577. The next prime is 78643613. The reversal of 78643597 is 79534687.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49364676 + 29278921 = 7026^2 + 5411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78643597 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78643597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78643507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39321798 + 39321799.

It is an arithmetic number, because the mean of its divisors is an integer number (39321799).

Almost surely, 2^78643597 is an apocalyptic number.

It is an amenable number.

78643597 is a deficient number, since it is larger than the sum of its proper divisors (1).

78643597 is an equidigital number, since it uses as much as digits as its factorization.

78643597 is an odious number, because the sum of its binary digits is odd.

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

The square root of 78643597 is about 8868.1225183237. The cubic root of 78643597 is about 428.4378089848.

The spelling of 78643597 in words is "seventy-eight million, six hundred forty-three thousand, five hundred ninety-seven".