78740288449 has 3 divisors (see below), whose sum is σ = 78740569057. Its totient is φ = 78740007842.

The previous prime is 78740288303. The next prime is 78740288453. The reversal of 78740288449 is 94488204787.

The square root of 78740288449 is 280607.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94488204787 = 265079 ⋅356453.

It is a de Polignac number, because none of the positive numbers 2^k-78740288449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78740288479) 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 in 2 ways as a sum of consecutive naturals, for example, 140304 + ... + 420910.

Almost surely, 2^78740288449 is an apocalyptic number.

78740288449 is the 280607-th square number.

78740288449 is the 140304-th centered octagonal number.

It is an amenable number.

78740288449 is a deficient number, since it is larger than the sum of its proper divisors (280608).

78740288449 is an frugal number, since it uses more digits than its factorization.

78740288449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561214 (or 280607 counting only the distinct ones).

The product of its (nonzero) digits is 28901376, while the sum is 61.

The spelling of 78740288449 in words is "seventy-eight billion, seven hundred forty million, two hundred eighty-eight thousand, four hundred forty-nine".