78731842 has 16 divisors (see below), whose sum is σ = 137257920. Its totient is φ = 33169968.

The previous prime is 78731837. The next prime is 78731843. The reversal of 78731842 is 24813787.

It is a junction number, because it is equal to n+sod(n) for n = 78731795 and 78731804.

It is not an unprimeable number, because it can be changed into a prime (78731843) 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, 46833 + ... + 48484.

It is an arithmetic number, because the mean of its divisors is an integer number (8578620).

Almost surely, 2^78731842 is an apocalyptic number.

78731842 is a deficient number, since it is larger than the sum of its proper divisors (58526078).

78731842 is a wasteful number, since it uses less digits than its factorization.

78731842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95385.

The product of its digits is 75264, while the sum is 40.

The square root of 78731842 is about 8873.0965282702. The cubic root of 78731842 is about 428.5979973264.

The spelling of 78731842 in words is "seventy-eight million, seven hundred thirty-one thousand, eight hundred forty-two".