78971438 has 24 divisors (see below), whose sum is σ = 148399272. Its totient is φ = 31240944.

The previous prime is 78971423. The next prime is 78971449. The reversal of 78971438 is 83417987.

It is a junction number, because it is equal to n+sod(n) for n = 78971392 and 78971401.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 29720 + ... + 32267.

It is an arithmetic number, because the mean of its divisors is an integer number (6183303).

Almost surely, 2^78971438 is an apocalyptic number.

78971438 is a deficient number, since it is larger than the sum of its proper divisors (69427834).

78971438 is a wasteful number, since it uses less digits than its factorization.

78971438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62016 (or 62009 counting only the distinct ones).

The product of its digits is 338688, while the sum is 47.

The square root of 78971438 is about 8886.5875340313. The cubic root of 78971438 is about 429.0323255056.

It can be divided in two parts, 789 and 71438, that added together give a palindrome (72227).

The spelling of 78971438 in words is "seventy-eight million, nine hundred seventy-one thousand, four hundred thirty-eight".