728491269289 has 9 divisors (see below), whose sum is σ = 847435569501. Its totient is φ = 624415966860.

The previous prime is 728491269283. The next prime is 728491269293. The reversal of 728491269289 is 982962194827.

The square root of 728491269289 is 853517.

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

It is not a de Polignac number, because 728491269289 - 2²¹ = 728489172137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728491269283) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5913654 + ... + 6035584.

Almost surely, 2^728491269289 is an apocalyptic number.

728491269289 is the 853517-th square number.

728491269289 is the 426759-th centered octagonal number.

It is an amenable number.

728491269289 is a deficient number, since it is larger than the sum of its proper divisors (118944300212).

728491269289 is an frugal number, since it uses more digits than its factorization.

728491269289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243876 (or 121938 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 67.

The spelling of 728491269289 in words is "seven hundred twenty-eight billion, four hundred ninety-one million, two hundred sixty-nine thousand, two hundred eighty-nine".