78729394 has 8 divisors (see below), whose sum is σ = 118338048. Its totient is φ = 39283380.

The previous prime is 78729373. The next prime is 78729419. The reversal of 78729394 is 49392787.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39442 + ... + 41389.

It is an arithmetic number, because the mean of its divisors is an integer number (14792256).

Almost surely, 2^78729394 is an apocalyptic number.

78729394 is a deficient number, since it is larger than the sum of its proper divisors (39608654).

78729394 is a wasteful number, since it uses less digits than its factorization.

78729394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81320.

The product of its digits is 762048, while the sum is 49.

The square root of 78729394 is about 8872.9585821190. The cubic root of 78729394 is about 428.5935551645.

The spelling of 78729394 in words is "seventy-eight million, seven hundred twenty-nine thousand, three hundred ninety-four".