728508889 has 4 divisors (see below), whose sum is σ = 739382224. Its totient is φ = 717635556.

The previous prime is 728508863. The next prime is 728508899. The reversal of 728508889 is 988805827.

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 728508889 - 2⁵ = 728508857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728508839) 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, 5436567 + ... + 5436700.

It is an arithmetic number, because the mean of its divisors is an integer number (184845556).

Almost surely, 2^728508889 is an apocalyptic number.

It is an amenable number.

728508889 is a deficient number, since it is larger than the sum of its proper divisors (10873335).

728508889 is a wasteful number, since it uses less digits than its factorization.

728508889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10873334.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The square root of 728508889 is about 26990.9038196204. The cubic root of 728508889 is about 899.7978513067.

The spelling of 728508889 in words is "seven hundred twenty-eight million, five hundred eight thousand, eight hundred eighty-nine".