78723842 has 16 divisors (see below), whose sum is σ = 120022560. Its totient is φ = 38721408.

The previous prime is 78723839. The next prime is 78723941. The reversal of 78723842 is 24832787.

It is a self number, because there is not a number n which added to its sum of digits gives 78723842.

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 7 ways as a sum of consecutive naturals, for example, 33593 + ... + 35859.

It is an arithmetic number, because the mean of its divisors is an integer number (7501410).

Almost surely, 2^78723842 is an apocalyptic number.

78723842 is a deficient number, since it is larger than the sum of its proper divisors (41298718).

78723842 is a wasteful number, since it uses less digits than its factorization.

78723842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545.

The product of its digits is 150528, while the sum is 41.

The square root of 78723842 is about 8872.6457159068. The cubic root of 78723842 is about 428.5834801161.

The spelling of 78723842 in words is "seventy-eight million, seven hundred twenty-three thousand, eight hundred forty-two".