78845129 has 4 divisors (see below), whose sum is σ = 86012880. Its totient is φ = 71677380.

The previous prime is 78845119. The next prime is 78845141. The reversal of 78845129 is 92154887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78845129 - 2²⁰ = 77796553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78845129.

It is not an unprimeable number, because it can be changed into a prime (78845119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3583859 + ... + 3583880.

It is an arithmetic number, because the mean of its divisors is an integer number (21503220).

Almost surely, 2^78845129 is an apocalyptic number.

It is an amenable number.

78845129 is a deficient number, since it is larger than the sum of its proper divisors (7167751).

78845129 is a wasteful number, since it uses less digits than its factorization.

78845129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7167750.

The product of its digits is 161280, while the sum is 44.

The square root of 78845129 is about 8879.4779688898. The cubic root of 78845129 is about 428.8034682445.

The spelling of 78845129 in words is "seventy-eight million, eight hundred forty-five thousand, one hundred twenty-nine".