78847542 has 48 divisors (see below), whose sum is σ = 179262720. Its totient is φ = 24999216.

The previous prime is 78847537. The next prime is 78847579. The reversal of 78847542 is 24574887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93559 + ... + 94397.

It is an arithmetic number, because the mean of its divisors is an integer number (3734640).

Almost surely, 2^78847542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78847542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89631360).

78847542 is an abundant number, since it is smaller than the sum of its proper divisors (100415178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78847542 is a wasteful number, since it uses less digits than its factorization.

78847542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1094 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 78847542 is about 8879.6138429551. The cubic root of 78847542 is about 428.8078426099.

The spelling of 78847542 in words is "seventy-eight million, eight hundred forty-seven thousand, five hundred forty-two".