78647347 has 4 divisors (see below), whose sum is σ = 79821256. Its totient is φ = 77473440.

The previous prime is 78647323. The next prime is 78647351. The reversal of 78647347 is 74374687.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78647347 - 2¹¹ = 78645299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78647297 and 78647306.

It is not an unprimeable number, because it can be changed into a prime (78647047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586854 + ... + 586987.

It is an arithmetic number, because the mean of its divisors is an integer number (19955314).

Almost surely, 2^78647347 is an apocalyptic number.

78647347 is a deficient number, since it is larger than the sum of its proper divisors (1173909).

78647347 is a wasteful number, since it uses less digits than its factorization.

78647347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173908.

The product of its digits is 790272, while the sum is 46.

The square root of 78647347 is about 8868.3339472530. Note that the first 3 decimals coincide. The cubic root of 78647347 is about 428.4446186777. Note that the first 3 decimals are identical.

The spelling of 78647347 in words is "seventy-eight million, six hundred forty-seven thousand, three hundred forty-seven".