728317869 has 4 divisors (see below), whose sum is σ = 971090496. Its totient is φ = 485545244.

The previous prime is 728317867. The next prime is 728317871. The reversal of 728317869 is 968713827.

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: 968713827 = 3 ⋅322904609.

It is an interprime number because it is at equal distance from previous prime (728317867) and next prime (728317871).

It is a cyclic number.

It is not a de Polignac number, because 728317869 - 2¹ = 728317867 is a prime.

It is a super-2 number, since 2×728317869² = 1060893836609402322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728317867) 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, 121386309 + ... + 121386314.

It is an arithmetic number, because the mean of its divisors is an integer number (242772624).

Almost surely, 2^728317869 is an apocalyptic number.

It is an amenable number.

728317869 is a deficient number, since it is larger than the sum of its proper divisors (242772627).

728317869 is a wasteful number, since it uses less digits than its factorization.

728317869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242772626.

The product of its digits is 1016064, while the sum is 51.

The square root of 728317869 is about 26987.3649880828. The cubic root of 728317869 is about 899.7192000539.

It can be divided in two parts, 7283 and 17869, that added together give a palindrome (25152).

The spelling of 728317869 in words is "seven hundred twenty-eight million, three hundred seventeen thousand, eight hundred sixty-nine".