728590889 has 4 divisors (see below), whose sum is σ = 784636356. Its totient is φ = 672545424.

The previous prime is 728590831. The next prime is 728590921. The reversal of 728590889 is 988095827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 253350889 + 475240000 = 15917^2 + 21800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728590889 is a prime.

It is a super-4 number, since 4×728590889⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728590829) 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, 28022714 + ... + 28022739.

It is an arithmetic number, because the mean of its divisors is an integer number (196159089).

Almost surely, 2^728590889 is an apocalyptic number.

It is an amenable number.

728590889 is a deficient number, since it is larger than the sum of its proper divisors (56045467).

728590889 is a wasteful number, since it uses less digits than its factorization.

728590889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56045466.

The product of its (nonzero) digits is 2903040, while the sum is 56.

The square root of 728590889 is about 26992.4228071509. The cubic root of 728590889 is about 899.8316100600.

The spelling of 728590889 in words is "seven hundred twenty-eight million, five hundred ninety thousand, eight hundred eighty-nine".