78842 has 8 divisors (see below), whose sum is σ = 120000. Its totient is φ = 38844.

The previous prime is 78839. The next prime is 78853. The reversal of 78842 is 24887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92 + ... + 407.

It is an arithmetic number, because the mean of its divisors is an integer number (15000).

2⁷⁸⁸⁴² is an apocalyptic number.

78842 is a deficient number, since it is larger than the sum of its proper divisors (41158).

78842 is a wasteful number, since it uses less digits than its factorization.

78842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580.

The product of its digits is 3584, while the sum is 29.

The square root of 78842 is about 280.7881763892. The cubic root of 78842 is about 42.8797795758.

The spelling of 78842 in words is "seventy-eight thousand, eight hundred forty-two".