78608129 has 2 divisors, whose sum is σ = 78608130. Its totient is φ = 78608128.

The previous prime is 78608099. The next prime is 78608137. The reversal of 78608129 is 92180687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70896400 + 7711729 = 8420^2 + 2777^2 .

It is an emirp because it is prime and its reverse (92180687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78608129 - 2⁸ = 78607873 is a prime.

It is not a weakly prime, because it can be changed into another prime (78628129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304064 + 39304065.

It is an arithmetic number, because the mean of its divisors is an integer number (39304065).

Almost surely, 2^78608129 is an apocalyptic number.

It is an amenable number.

78608129 is a deficient number, since it is larger than the sum of its proper divisors (1).

78608129 is an equidigital number, since it uses as much as digits as its factorization.

78608129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 78608129 is about 8866.1225459611. The cubic root of 78608129 is about 428.3733912920.

The spelling of 78608129 in words is "seventy-eight million, six hundred eight thousand, one hundred twenty-nine".