78939742 has 16 divisors (see below), whose sum is σ = 135971712. Its totient is φ = 33669720.

The previous prime is 78939697. The next prime is 78939761. The reversal of 78939742 is 24793987.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10408 + ... + 16315.

It is an arithmetic number, because the mean of its divisors is an integer number (8498232).

Almost surely, 2^78939742 is an apocalyptic number.

78939742 is a deficient number, since it is larger than the sum of its proper divisors (57031970).

78939742 is a wasteful number, since it uses less digits than its factorization.

78939742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26943.

The product of its digits is 762048, while the sum is 49.

The square root of 78939742 is about 8884.8039933360. The cubic root of 78939742 is about 428.9749189771.

The spelling of 78939742 in words is "seventy-eight million, nine hundred thirty-nine thousand, seven hundred forty-two".