78927613 has 2 divisors, whose sum is σ = 78927614. Its totient is φ = 78927612.

The previous prime is 78927601. The next prime is 78927637. The reversal of 78927613 is 31672987.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76790169 + 2137444 = 8763^2 + 1462^2 .

It is an emirp because it is prime and its reverse (31672987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78927613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78927613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78927683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39463806 + 39463807.

It is an arithmetic number, because the mean of its divisors is an integer number (39463807).

Almost surely, 2^78927613 is an apocalyptic number.

It is an amenable number.

78927613 is a deficient number, since it is larger than the sum of its proper divisors (1).

78927613 is an equidigital number, since it uses as much as digits as its factorization.

78927613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 78927613 is about 8884.1213971895. The cubic root of 78927613 is about 428.9529473519.

The spelling of 78927613 in words is "seventy-eight million, nine hundred twenty-seven thousand, six hundred thirteen".