728101 has 4 divisors (see below), whose sum is σ = 794304. Its totient is φ = 661900.

The previous prime is 728087. The next prime is 728113. The reversal of 728101 is 101827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101827 = 11 ⋅9257.

It is a cyclic number.

It is not a de Polignac number, because 728101 - 2⁵ = 728069 is a prime.

It is a Duffinian number.

728101 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728131) 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, 33085 + ... + 33106.

It is an arithmetic number, because the mean of its divisors is an integer number (198576).

2⁷²⁸¹⁰¹ is an apocalyptic number.

It is an amenable number.

728101 is a deficient number, since it is larger than the sum of its proper divisors (66203).

728101 is a wasteful number, since it uses less digits than its factorization.

728101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66202.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 728101 is about 853.2883451683. The cubic root of 728101 is about 89.9629888971.

Adding to 728101 its reverse (101827), we get a palindrome (829928).

The spelling of 728101 in words is "seven hundred twenty-eight thousand, one hundred one".