78945079 has 4 divisors (see below), whose sum is σ = 78978600. Its totient is φ = 78911560.

The previous prime is 78945029. The next prime is 78945107. The reversal of 78945079 is 97054987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97054987 = 397 ⋅244471.

It is a cyclic number.

It is not a de Polignac number, because 78945079 - 2⁷ = 78944951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78945029) 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, 12937 + ... + 18034.

It is an arithmetic number, because the mean of its divisors is an integer number (19744650).

Almost surely, 2^78945079 is an apocalyptic number.

78945079 is a deficient number, since it is larger than the sum of its proper divisors (33521).

78945079 is a wasteful number, since it uses less digits than its factorization.

78945079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33520.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 78945079 is about 8885.1043325332. The cubic root of 78945079 is about 428.9845862140.

The spelling of 78945079 in words is "seventy-eight million, nine hundred forty-five thousand, seventy-nine".