78173894 has 8 divisors (see below), whose sum is σ = 117304320. Its totient is φ = 39072456.

The previous prime is 78173891. The next prime is 78173917. The reversal of 78173894 is 49837187.

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

It is a super-2 number, since 2×78173894² = 12222315406246472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78173891) 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, 1712 + ... + 12620.

It is an arithmetic number, because the mean of its divisors is an integer number (14663040).

Almost surely, 2^78173894 is an apocalyptic number.

78173894 is a deficient number, since it is larger than the sum of its proper divisors (39130426).

78173894 is a wasteful number, since it uses less digits than its factorization.

78173894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14494.

The product of its digits is 338688, while the sum is 47.

The square root of 78173894 is about 8841.6001945349. The cubic root of 78173894 is about 427.5831494726.

It can be divided in two parts, 7817 and 3894, that added together give a palindrome (11711).

The spelling of 78173894 in words is "seventy-eight million, one hundred seventy-three thousand, eight hundred ninety-four".