728761 has 8 divisors (see below), whose sum is σ = 804384. Its totient is φ = 654720.

The previous prime is 728747. The next prime is 728771. The reversal of 728761 is 167827.

It is a happy number.

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

It is not a de Polignac number, because 728761 - 2⁵ = 728729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728701) 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, 726 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁷²⁸⁷⁶¹ is an apocalyptic number.

It is an amenable number.

728761 is a deficient number, since it is larger than the sum of its proper divisors (75623).

728761 is a wasteful number, since it uses less digits than its factorization.

728761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791.

The product of its digits is 4704, while the sum is 31.

The square root of 728761 is about 853.6749967054. The cubic root of 728761 is about 89.9901635340.

The spelling of 728761 in words is "seven hundred twenty-eight thousand, seven hundred sixty-one".