78136812642 has 32 divisors (see below), whose sum is σ = 178606933632. Its totient is φ = 22323740544.

The previous prime is 78136812641. The next prime is 78136812643. The reversal of 78136812642 is 24621863187.

It is an interprime number because it is at equal distance from previous prime (78136812641) and next prime (78136812643).

It is a super-2 number, since 2×78136812642² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78136812591 and 78136812600.

It is not an unprimeable number, because it can be changed into a prime (78136812641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1409758 + ... + 1464134.

It is an arithmetic number, because the mean of its divisors is an integer number (5581466676).

Almost surely, 2^78136812642 is an apocalyptic number.

78136812642 is an abundant number, since it is smaller than the sum of its proper divisors (100470120990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78136812642 is a wasteful number, since it uses less digits than its factorization.

78136812642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88602.

The product of its digits is 774144, while the sum is 48.

The spelling of 78136812642 in words is "seventy-eight billion, one hundred thirty-six million, eight hundred twelve thousand, six hundred forty-two".