78365283844 has 9 divisors (see below), whose sum is σ = 137140226517. Its totient is φ = 39182361984.

The previous prime is 78365283839. The next prime is 78365283869. The reversal of 78365283844 is 44838256387.

It is a happy number.

The square root of 78365283844 is 279938.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2454013444 + 75911270400 = 49538^2 + 275520^2 .

It is a super-2 number, since 2×78365283844² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 489892 + ... + 629860.

Almost surely, 2^78365283844 is an apocalyptic number.

78365283844 is the 279938-th square number.

It is an amenable number.

78365283844 is a deficient number, since it is larger than the sum of its proper divisors (58774942673).

78365283844 is an frugal number, since it uses more digits than its factorization.

78365283844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279942 (or 139971 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 58.

The spelling of 78365283844 in words is "seventy-eight billion, three hundred sixty-five million, two hundred eighty-three thousand, eight hundred forty-four".