78485319838 has 4 divisors (see below), whose sum is σ = 117727979760. Its totient is φ = 39242659918.

The previous prime is 78485319821. The next prime is 78485319919. The reversal of 78485319838 is 83891358487.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78485319838.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19621329958 + ... + 19621329961.

It is an arithmetic number, because the mean of its divisors is an integer number (29431994940).

Almost surely, 2^78485319838 is an apocalyptic number.

78485319838 is a deficient number, since it is larger than the sum of its proper divisors (39242659922).

78485319838 is a wasteful number, since it uses less digits than its factorization.

78485319838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39242659921.

The product of its digits is 46448640, while the sum is 64.

The spelling of 78485319838 in words is "seventy-eight billion, four hundred eighty-five million, three hundred nineteen thousand, eight hundred thirty-eight".