728222569 has 4 divisors (see below), whose sum is σ = 734903620. Its totient is φ = 721541520.

The previous prime is 728222533. The next prime is 728222609. The reversal of 728222569 is 965222827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 965222827 = 313 ⋅3083779.

It can be written as a sum of positive squares in 2 ways, for example, as 408242025 + 319980544 = 20205^2 + 17888^2 .

It is a cyclic number.

It is not a de Polignac number, because 728222569 - 2²⁵ = 694668137 is a prime.

It is a super-2 number, since 2×728222569² = 1060616220001919522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728222269) 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, 3340362 + ... + 3340579.

It is an arithmetic number, because the mean of its divisors is an integer number (183725905).

Almost surely, 2^728222569 is an apocalyptic number.

It is an amenable number.

728222569 is a deficient number, since it is larger than the sum of its proper divisors (6681051).

728222569 is a wasteful number, since it uses less digits than its factorization.

728222569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6681050.

The product of its digits is 241920, while the sum is 43.

The square root of 728222569 is about 26985.5992892506. The cubic root of 728222569 is about 899.6799557516.

The spelling of 728222569 in words is "seven hundred twenty-eight million, two hundred twenty-two thousand, five hundred sixty-nine".