728641 has 8 divisors (see below), whose sum is σ = 766080. Its totient is φ = 692208.

The previous prime is 728639. The next prime is 728647. The reversal of 728641 is 146827.

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 728641 - 2¹ = 728639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728647) 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, 1530 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (95760).

2⁷²⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

728641 is a deficient number, since it is larger than the sum of its proper divisors (37439).

728641 is a wasteful number, since it uses less digits than its factorization.

728641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its digits is 2688, while the sum is 28.

The square root of 728641 is about 853.6047094528. The cubic root of 728641 is about 89.9852239117.

It can be divided in two parts, 728 and 641, that added together give a square (1369 = 37²).

The spelling of 728641 in words is "seven hundred twenty-eight thousand, six hundred forty-one".