728653 has 4 divisors (see below), whose sum is σ = 731808. Its totient is φ = 725500.

The previous prime is 728647. The next prime is 728659. The reversal of 728653 is 356827.

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: 356827 = 239 ⋅1493.

It is an interprime number because it is at equal distance from previous prime (728647) and next prime (728659).

It is a cyclic number.

It is not a de Polignac number, because 728653 - 2¹⁷ = 597581 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 (728659) 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, 1201 + ... + 1702.

It is an arithmetic number, because the mean of its divisors is an integer number (182952).

2⁷²⁸⁶⁵³ is an apocalyptic number.

It is an amenable number.

728653 is a deficient number, since it is larger than the sum of its proper divisors (3155).

728653 is a wasteful number, since it uses less digits than its factorization.

728653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154.

The product of its digits is 10080, while the sum is 31.

The square root of 728653 is about 853.6117384385. The cubic root of 728653 is about 89.9857178983.

The spelling of 728653 in words is "seven hundred twenty-eight thousand, six hundred fifty-three".