728691 has 8 divisors (see below), whose sum is σ = 976080. Its totient is φ = 483552.

The previous prime is 728687. The next prime is 728699. The reversal of 728691 is 196827.

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

It is not a de Polignac number, because 728691 - 2² = 728687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728699) 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, 465 + ... + 1293.

It is an arithmetic number, because the mean of its divisors is an integer number (122010).

2⁷²⁸⁶⁹¹ is an apocalyptic number.

728691 is a deficient number, since it is larger than the sum of its proper divisors (247389).

728691 is a wasteful number, since it uses less digits than its factorization.

728691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125.

The product of its digits is 6048, while the sum is 33.

The square root of 728691 is about 853.6339965114. The cubic root of 728691 is about 89.9872821536.

The spelling of 728691 in words is "seven hundred twenty-eight thousand, six hundred ninety-one".