78738613 has 2 divisors, whose sum is σ = 78738614. Its totient is φ = 78738612.

The previous prime is 78738607. The next prime is 78738619. The reversal of 78738613 is 31683787.

It is a balanced prime because it is at equal distance from previous prime (78738607) and next prime (78738619).

It can be written as a sum of positive squares in only one way, i.e., 74252689 + 4485924 = 8617^2 + 2118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78738613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78738613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78738619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39369306 + 39369307.

It is an arithmetic number, because the mean of its divisors is an integer number (39369307).

Almost surely, 2^78738613 is an apocalyptic number.

It is an amenable number.

78738613 is a deficient number, since it is larger than the sum of its proper divisors (1).

78738613 is an equidigital number, since it uses as much as digits as its factorization.

78738613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 78738613 is about 8873.4780666884. The cubic root of 78738613 is about 428.6102835619.

The spelling of 78738613 in words is "seventy-eight million, seven hundred thirty-eight thousand, six hundred thirteen".