78729385 has 8 divisors (see below), whose sum is σ = 107971776. Its totient is φ = 53985840.

The previous prime is 78729373. The next prime is 78729419. The reversal of 78729385 is 58392787.

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

It is not a de Polignac number, because 78729385 - 2⁷ = 78729257 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 1124671 + ... + 1124740.

It is an arithmetic number, because the mean of its divisors is an integer number (13496472).

Almost surely, 2^78729385 is an apocalyptic number.

It is an amenable number.

78729385 is a deficient number, since it is larger than the sum of its proper divisors (29242391).

78729385 is a wasteful number, since it uses less digits than its factorization.

78729385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249423.

The product of its digits is 846720, while the sum is 49.

The square root of 78729385 is about 8872.9580749601. The cubic root of 78729385 is about 428.5935388328.

The spelling of 78729385 in words is "seventy-eight million, seven hundred twenty-nine thousand, three hundred eighty-five".