728491 has 8 divisors (see below), whose sum is σ = 753984. Its totient is φ = 703560.

The previous prime is 728489. The next prime is 728521. The reversal of 728491 is 194827.

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 728491 - 2¹ = 728489 is a prime.

It is a Duffinian number.

728491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (728471) 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, 5496 + ... + 5626.

It is an arithmetic number, because the mean of its divisors is an integer number (94248).

2⁷²⁸⁴⁹¹ is an apocalyptic number.

728491 is a deficient number, since it is larger than the sum of its proper divisors (25493).

728491 is a wasteful number, since it uses less digits than its factorization.

728491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

The product of its digits is 4032, while the sum is 31.

The square root of 728491 is about 853.5168422474. The cubic root of 728491 is about 89.9790486210.

The spelling of 728491 in words is "seven hundred twenty-eight thousand, four hundred ninety-one".