78608137 has 2 divisors, whose sum is σ = 78608138. Its totient is φ = 78608136.

The previous prime is 78608129. The next prime is 78608191. The reversal of 78608137 is 73180687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76370121 + 2238016 = 8739^2 + 1496^2 .

It is a cyclic number.

It is not a de Polignac number, because 78608137 - 2³ = 78608129 is a prime.

It is a super-2 number, since 2×78608137² = 12358478405221538, which contains 22 as substring.

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 78608137.

It is not a weakly prime, because it can be changed into another prime (78608437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304068 + 39304069.

It is an arithmetic number, because the mean of its divisors is an integer number (39304069).

Almost surely, 2^78608137 is an apocalyptic number.

It is an amenable number.

78608137 is a deficient number, since it is larger than the sum of its proper divisors (1).

78608137 is an equidigital number, since it uses as much as digits as its factorization.

78608137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 78608137 is about 8866.1229971166. The cubic root of 78608137 is about 428.3734058240.

The spelling of 78608137 in words is "seventy-eight million, six hundred eight thousand, one hundred thirty-seven".