728663 has 8 divisors (see below), whose sum is σ = 819168. Its totient is φ = 643104.

The previous prime is 728659. The next prime is 728681. The reversal of 728663 is 366827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728663 - 2² = 728659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920 + ... + 1517.

It is an arithmetic number, because the mean of its divisors is an integer number (102396).

2⁷²⁸⁶⁶³ is an apocalyptic number.

728663 is a deficient number, since it is larger than the sum of its proper divisors (90505).

728663 is a wasteful number, since it uses less digits than its factorization.

728663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473.

The product of its digits is 12096, while the sum is 32.

The square root of 728663 is about 853.6175958824. The cubic root of 728663 is about 89.9861295497.

The spelling of 728663 in words is "seven hundred twenty-eight thousand, six hundred sixty-three".