9928727449 has 3 divisors (see below), whose sum is σ = 9928827093. Its totient is φ = 9928627806.

The previous prime is 9928727441. The next prime is 9928727453. The reversal of 9928727449 is 9447278299.

The square root of 9928727449 is 99643.

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: 9447278299 = 59 ⋅160123361.

It is not a de Polignac number, because 9928727449 - 2³ = 9928727441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9928727441) 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 2 ways as a sum of consecutive naturals, for example, 49822 + ... + 149464.

It is an arithmetic number, because the mean of its divisors is an integer number (3309609031).

Almost surely, 2^9928727449 is an apocalyptic number.

9928727449 is the 99643-rd square number.

9928727449 is the 49822-nd centered octagonal number.

It is an amenable number.

9928727449 is a deficient number, since it is larger than the sum of its proper divisors (99644).

9928727449 is an frugal number, since it uses more digits than its factorization.

9928727449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199286 (or 99643 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 61.

The cubic root of 9928727449 is about 2149.3040797238.

It can be divided in two parts, 99287 and 27449, that added together give a square (126736 = 356²).

The spelling of 9928727449 in words is "nine billion, nine hundred twenty-eight million, seven hundred twenty-seven thousand, four hundred forty-nine".