78744874289 has 4 divisors (see below), whose sum is σ = 78753763824. Its totient is φ = 78735984756.

The previous prime is 78744874217. The next prime is 78744874291. The reversal of 78744874289 is 98247844787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98247844787 = 175267 ⋅560561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78744874289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78744876289) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4431467 + ... + 4449200.

It is an arithmetic number, because the mean of its divisors is an integer number (19688440956).

Almost surely, 2^78744874289 is an apocalyptic number.

It is an amenable number.

78744874289 is a deficient number, since it is larger than the sum of its proper divisors (8889535).

78744874289 is an equidigital number, since it uses as much as digits as its factorization.

78744874289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8889534.

The product of its digits is 202309632, while the sum is 68.

The spelling of 78744874289 in words is "seventy-eight billion, seven hundred forty-four million, eight hundred seventy-four thousand, two hundred eighty-nine".