78534847 has 4 divisors (see below), whose sum is σ = 82668280. Its totient is φ = 74401416.

The previous prime is 78534829. The next prime is 78534853. The reversal of 78534847 is 74843587.

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

It is a de Polignac number, because none of the positive numbers 2^k-78534847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78534797 and 78534806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78534047) 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, 2066688 + ... + 2066725.

It is an arithmetic number, because the mean of its divisors is an integer number (20667070).

Almost surely, 2^78534847 is an apocalyptic number.

78534847 is a deficient number, since it is larger than the sum of its proper divisors (4133433).

78534847 is a wasteful number, since it uses less digits than its factorization.

78534847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133432.

The product of its digits is 752640, while the sum is 46.

The square root of 78534847 is about 8861.9888851205. The cubic root of 78534847 is about 428.2402336515.

The spelling of 78534847 in words is "seventy-eight million, five hundred thirty-four thousand, eight hundred forty-seven".