1298715728 has 20 divisors (see below), whose sum is σ = 2516886528. Its totient is φ = 649196640.

The previous prime is 1298715727. The next prime is 1298715779. The reversal of 1298715728 is 8275178921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298715727) 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, 81713 + ... + 96303.

Almost surely, 2^1298715728 is an apocalyptic number.

It is an amenable number.

1298715728 is a deficient number, since it is larger than the sum of its proper divisors (1218170800).

1298715728 is a wasteful number, since it uses less digits than its factorization.

1298715728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20162 (or 20156 counting only the distinct ones).

The product of its digits is 564480, while the sum is 50.

The square root of 1298715728 is about 36037.6987056610. The cubic root of 1298715728 is about 1091.0333684107.

The spelling of 1298715728 in words is "one billion, two hundred ninety-eight million, seven hundred fifteen thousand, seven hundred twenty-eight".