78704044081 has 4 divisors (see below), whose sum is σ = 84758201332. Its totient is φ = 72649886832.

The previous prime is 78704044079. The next prime is 78704044087. The reversal of 78704044081 is 18044040787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18044040787 = 29 ⋅622208303.

It can be written as a sum of positive squares in 2 ways, for example, as 36640085056 + 42063959025 = 191416^2 + 205095^2 .

It is a cyclic number.

It is not a de Polignac number, because 78704044081 - 2¹ = 78704044079 is a prime.

It is a super-2 number, since 2×78704044081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78704044087) 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 3 ways as a sum of consecutive naturals, for example, 3027078606 + ... + 3027078631.

It is an arithmetic number, because the mean of its divisors is an integer number (21189550333).

Almost surely, 2^78704044081 is an apocalyptic number.

It is an amenable number.

78704044081 is a deficient number, since it is larger than the sum of its proper divisors (6054157251).

78704044081 is a wasteful number, since it uses less digits than its factorization.

78704044081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054157250.

The product of its (nonzero) digits is 200704, while the sum is 43.

The spelling of 78704044081 in words is "seventy-eight billion, seven hundred four million, forty-four thousand, eighty-one".