78297839882 has 4 divisors (see below), whose sum is σ = 117446759826. Its totient is φ = 39148919940.

The previous prime is 78297839869. The next prime is 78297839887. The reversal of 78297839882 is 28893879287.

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

It can be written as a sum of positive squares in only one way, i.e., 77250087721 + 1047752161 = 277939^2 + 32369^2 .

It is a super-2 number, since 2×78297839882² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78297839887) by changing a digit.

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, 19574459969 + ... + 19574459972.

Almost surely, 2^78297839882 is an apocalyptic number.

78297839882 is a deficient number, since it is larger than the sum of its proper divisors (39148919944).

78297839882 is a wasteful number, since it uses less digits than its factorization.

78297839882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39148919943.

The product of its digits is 195084288, while the sum is 71.

The spelling of 78297839882 in words is "seventy-eight billion, two hundred ninety-seven million, eight hundred thirty-nine thousand, eight hundred eighty-two".