78555823 has 8 divisors (see below), whose sum is σ = 82836720. Its totient is φ = 74289600.

The previous prime is 78555803. The next prime is 78555857. The reversal of 78555823 is 32855587.

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 78555823 - 2⁵ = 78555791 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 78555823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78555803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8373 + ... + 15073.

It is an arithmetic number, because the mean of its divisors is an integer number (10354590).

Almost surely, 2^78555823 is an apocalyptic number.

78555823 is a deficient number, since it is larger than the sum of its proper divisors (4280897).

78555823 is a wasteful number, since it uses less digits than its factorization.

78555823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7337.

The product of its digits is 336000, while the sum is 43.

The square root of 78555823 is about 8863.1722876180. The cubic root of 78555823 is about 428.2783567177.

The spelling of 78555823 in words is "seventy-eight million, five hundred fifty-five thousand, eight hundred twenty-three".