78438305 has 8 divisors (see below), whose sum is σ = 102682944. Its totient is φ = 57046000.

The previous prime is 78438293. The next prime is 78438319. The reversal of 78438305 is 50383487.

It is a happy number.

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

It is not a de Polignac number, because 78438305 - 2⁸ = 78438049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713021 + ... + 713130.

It is an arithmetic number, because the mean of its divisors is an integer number (12835368).

Almost surely, 2^78438305 is an apocalyptic number.

It is an amenable number.

78438305 is a deficient number, since it is larger than the sum of its proper divisors (24244639).

78438305 is a wasteful number, since it uses less digits than its factorization.

78438305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426167.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 78438305 is about 8856.5402387162. The cubic root of 78438305 is about 428.0646847383.

The spelling of 78438305 in words is "seventy-eight million, four hundred thirty-eight thousand, three hundred five".