728643593 has 4 divisors (see below), whose sum is σ = 735857988. Its totient is φ = 721429200.

The previous prime is 728643583. The next prime is 728643659. The reversal of 728643593 is 395346827.

It is a happy number.

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 599662144 + 128981449 = 24488^2 + 11357^2 .

It is a cyclic number.

It is not a de Polignac number, because 728643593 - 2⁸ = 728643337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (728643563) 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, 3607046 + ... + 3607247.

It is an arithmetic number, because the mean of its divisors is an integer number (183964497).

Almost surely, 2^728643593 is an apocalyptic number.

It is an amenable number.

728643593 is a deficient number, since it is larger than the sum of its proper divisors (7214395).

728643593 is a wasteful number, since it uses less digits than its factorization.

728643593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7214394.

The product of its digits is 1088640, while the sum is 47.

The square root of 728643593 is about 26993.3990634748. The cubic root of 728643593 is about 899.8533065440.

The spelling of 728643593 in words is "seven hundred twenty-eight million, six hundred forty-three thousand, five hundred ninety-three".