78636013 has 2 divisors, whose sum is σ = 78636014. Its totient is φ = 78636012.

The previous prime is 78635983. The next prime is 78636043. The reversal of 78636013 is 31063687.

It is a balanced prime because it is at equal distance from previous prime (78635983) and next prime (78636043).

It can be written as a sum of positive squares in only one way, i.e., 52809289 + 25826724 = 7267^2 + 5082^2 .

It is a cyclic number.

It is not a de Polignac number, because 78636013 - 2⁵ = 78635981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78636013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78636043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39318006 + 39318007.

It is an arithmetic number, because the mean of its divisors is an integer number (39318007).

Almost surely, 2^78636013 is an apocalyptic number.

It is an amenable number.

78636013 is a deficient number, since it is larger than the sum of its proper divisors (1).

78636013 is an equidigital number, since it uses as much as digits as its factorization.

78636013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 78636013 is about 8867.6949090505. The cubic root of 78636013 is about 428.4240364001.

The spelling of 78636013 in words is "seventy-eight million, six hundred thirty-six thousand, thirteen".