728461 has 4 divisors (see below), whose sum is σ = 733500. Its totient is φ = 723424.

The previous prime is 728437. The next prime is 728471. The reversal of 728461 is 164827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 280900 + 447561 = 530^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 728461 - 2⁷ = 728333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2296 + ... + 2593.

It is an arithmetic number, because the mean of its divisors is an integer number (183375).

2⁷²⁸⁴⁶¹ is an apocalyptic number.

It is an amenable number.

728461 is a deficient number, since it is larger than the sum of its proper divisors (5039).

728461 is a wasteful number, since it uses less digits than its factorization.

728461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038.

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

The square root of 728461 is about 853.4992677208. The cubic root of 728461 is about 89.9778134611.

The spelling of 728461 in words is "seven hundred twenty-eight thousand, four hundred sixty-one".