78578791 has 8 divisors (see below), whose sum is σ = 79168320. Its totient is φ = 77992032.

The previous prime is 78578789. The next prime is 78578809. The reversal of 78578791 is 19787587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78578791 - 2¹ = 78578789 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78578711) 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 7 ways as a sum of consecutive naturals, for example, 108930 + ... + 109648.

It is an arithmetic number, because the mean of its divisors is an integer number (9896040).

Almost surely, 2^78578791 is an apocalyptic number.

78578791 is a deficient number, since it is larger than the sum of its proper divisors (589529).

78578791 is a wasteful number, since it uses less digits than its factorization.

78578791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385.

The product of its digits is 987840, while the sum is 52.

The square root of 78578791 is about 8864.4678915319. The cubic root of 78578791 is about 428.3200923838.

The spelling of 78578791 in words is "seventy-eight million, five hundred seventy-eight thousand, seven hundred ninety-one".