78008939 has 4 divisors (see below), whose sum is σ = 81400656. Its totient is φ = 74617224.

The previous prime is 78008933. The next prime is 78008941. The reversal of 78008939 is 93980087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93980087 = 181 ⋅519227.

It is a cyclic number.

It is not a de Polignac number, because 78008939 - 2²⁰ = 76960363 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 78008939.

It is not an unprimeable number, because it can be changed into a prime (78008933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1695824 + ... + 1695869.

It is an arithmetic number, because the mean of its divisors is an integer number (20350164).

Almost surely, 2^78008939 is an apocalyptic number.

78008939 is a deficient number, since it is larger than the sum of its proper divisors (3391717).

78008939 is a wasteful number, since it uses less digits than its factorization.

78008939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391716.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 78008939 is about 8832.2669230498. The cubic root of 78008939 is about 427.2821894677.

The spelling of 78008939 in words is "seventy-eight million, eight thousand, nine hundred thirty-nine".