78938445 has 16 divisors (see below), whose sum is σ = 132949440. Its totient is φ = 39884544.

The previous prime is 78938443. The next prime is 78938449. The reversal of 78938445 is 54483987.

It is not a de Polignac number, because 78938445 - 2¹ = 78938443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78938394 and 78938403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78938443) 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 15 ways as a sum of consecutive naturals, for example, 138204 + ... + 138773.

It is an arithmetic number, because the mean of its divisors is an integer number (8309340).

Almost surely, 2^78938445 is an apocalyptic number.

It is an amenable number.

78938445 is a deficient number, since it is larger than the sum of its proper divisors (54010995).

78938445 is a wasteful number, since it uses less digits than its factorization.

78938445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277004.

The product of its digits is 967680, while the sum is 48.

The square root of 78938445 is about 8884.7310032437. The cubic root of 78938445 is about 428.9725695753.

The spelling of 78938445 in words is "seventy-eight million, nine hundred thirty-eight thousand, four hundred forty-five".