728501 has 4 divisors (see below), whose sum is σ = 771372. Its totient is φ = 685632.

The previous prime is 728489. The next prime is 728521. The reversal of 728501 is 105827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105827 = 97 ⋅1091.

It can be written as a sum of positive squares in 2 ways, for example, as 682276 + 46225 = 826^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 728501 - 2⁶ = 728437 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 (728521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21410 + ... + 21443.

It is an arithmetic number, because the mean of its divisors is an integer number (192843).

2⁷²⁸⁵⁰¹ is an apocalyptic number.

It is an amenable number.

728501 is a deficient number, since it is larger than the sum of its proper divisors (42871).

728501 is a wasteful number, since it uses less digits than its factorization.

728501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42870.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 728501 is about 853.5227003425. The cubic root of 728501 is about 89.9794603334.

The spelling of 728501 in words is "seven hundred twenty-eight thousand, five hundred one".