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728031 = 3242677

728031 has 4 divisors (see below), whose sum is σ = 970712. Its totient is φ = 485352.

The previous prime is 728027. The next prime is 728047. The reversal of 728031 is 130827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130827 = 343609.

It is not a de Polignac number, because 728031 - 22 = 728027 is a prime.

It is a super-2 number, since 2×7280312 = 1060058273922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 727989 and 728007.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728031.

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, 121336 + ... + 121341.

It is an arithmetic number, because the mean of its divisors is an integer number (242678).

2728031 is an apocalyptic number.

728031 is a deficient number, since it is larger than the sum of its proper divisors (242681).

728031 is a wasteful number, since it uses less digits than its factorization.

728031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242680.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 728031 is about 853.2473263949. The cubic root of 728031 is about 89.9601057755.

Adding to 728031 its reverse (130827), we get a palindrome (858858).

The spelling of 728031 in words is "seven hundred twenty-eight thousand, thirty-one".

Divisors: 1 3 242677 728031