78047847 has 16 divisors (see below), whose sum is σ = 115795680. Its totient is φ = 51955776.

The previous prime is 78047843. The next prime is 78047861. The reversal of 78047847 is 74874087.

It is not a de Polignac number, because 78047847 - 2² = 78047843 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78047843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21453 + ... + 24825.

It is an arithmetic number, because the mean of its divisors is an integer number (7237230).

Almost surely, 2^78047847 is an apocalyptic number.

78047847 is a deficient number, since it is larger than the sum of its proper divisors (37747833).

78047847 is a wasteful number, since it uses less digits than its factorization.

78047847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239 (or 4233 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The square root of 78047847 is about 8834.4692540073. The cubic root of 78047847 is about 427.3532152265.

It can be divided in two parts, 7804 and 7847, that added together give a palindrome (15651).

The spelling of 78047847 in words is "seventy-eight million, forty-seven thousand, eight hundred forty-seven".