78481236689 has 8 divisors (see below), whose sum is σ = 81190748520. Its totient is φ = 75771942400.

The previous prime is 78481236683. The next prime is 78481236697. The reversal of 78481236689 is 98663218487.

It can be written as a sum of positive squares in 4 ways, for example, as 4002460225 + 74478776464 = 63265^2 + 272908^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78481236689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78481236683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1083179 + ... + 1153359.

It is an arithmetic number, because the mean of its divisors is an integer number (10148843565).

Almost surely, 2^78481236689 is an apocalyptic number.

It is an amenable number.

78481236689 is a deficient number, since it is larger than the sum of its proper divisors (2709511831).

78481236689 is a wasteful number, since it uses less digits than its factorization.

78481236689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108771.

The product of its digits is 27869184, while the sum is 62.

The spelling of 78481236689 in words is "seventy-eight billion, four hundred eighty-one million, two hundred thirty-six thousand, six hundred eighty-nine".