78842547 has 24 divisors (see below), whose sum is σ = 132926976. Its totient is φ = 44092656.

The previous prime is 78842531. The next prime is 78842557. The reversal of 78842547 is 74524887.

It is not a de Polignac number, because 78842547 - 2⁴ = 78842531 is a prime.

It is a super-2 number, since 2×78842547² = 12432294434894418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78842507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10353 + ... + 16274.

It is an arithmetic number, because the mean of its divisors is an integer number (5538624).

Almost surely, 2^78842547 is an apocalyptic number.

78842547 is a deficient number, since it is larger than the sum of its proper divisors (54084429).

78842547 is a wasteful number, since it uses less digits than its factorization.

78842547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26687 (or 26684 counting only the distinct ones).

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

The square root of 78842547 is about 8879.3325762695. The cubic root of 78842547 is about 428.7987874115.

The spelling of 78842547 in words is "seventy-eight million, eight hundred forty-two thousand, five hundred forty-seven".