78512842 has 16 divisors (see below), whose sum is σ = 120932352. Its totient is φ = 38211280.

The previous prime is 78512839. The next prime is 78512849. The reversal of 78512842 is 24821587.

It is not an unprimeable number, because it can be changed into a prime (78512849) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15768 + ... + 20140.

It is an arithmetic number, because the mean of its divisors is an integer number (7558272).

Almost surely, 2^78512842 is an apocalyptic number.

78512842 is a deficient number, since it is larger than the sum of its proper divisors (42419510).

78512842 is a wasteful number, since it uses less digits than its factorization.

78512842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4613.

The product of its digits is 35840, while the sum is 37.

The square root of 78512842 is about 8860.7472596841. The cubic root of 78512842 is about 428.2002331211.

The spelling of 78512842 in words is "seventy-eight million, five hundred twelve thousand, eight hundred forty-two".