728318089 has 4 divisors (see below), whose sum is σ = 766650640. Its totient is φ = 689985540.

The previous prime is 728318083. The next prime is 728318099. The reversal of 728318089 is 980813827.

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.

It is a cyclic number.

It is not a de Polignac number, because 728318089 - 2¹¹ = 728316041 is a prime.

It is a super-2 number, since 2×728318089² = 1060894477529223842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728318083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19166247 + ... + 19166284.

It is an arithmetic number, because the mean of its divisors is an integer number (191662660).

Almost surely, 2^728318089 is an apocalyptic number.

It is an amenable number.

728318089 is a deficient number, since it is larger than the sum of its proper divisors (38332551).

728318089 is a wasteful number, since it uses less digits than its factorization.

728318089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38332550.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 728318089 is about 26987.3690640640. The cubic root of 728318089 is about 899.7192906454.

The spelling of 728318089 in words is "seven hundred twenty-eight million, three hundred eighteen thousand, eighty-nine".