89729 has 4 divisors (see below), whose sum is σ = 91476. Its totient is φ = 87984.

The previous prime is 89689. The next prime is 89753. The reversal of 89729 is 92798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92798 = 2 ⋅46399.

It can be written as a sum of positive squares in 2 ways, for example, as 49729 + 40000 = 223^2 + 200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89759) 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, 794 + ... + 899.

It is an arithmetic number, because the mean of its divisors is an integer number (22869).

2⁸⁹⁷²⁹ is an apocalyptic number.

It is an amenable number.

89729 is a deficient number, since it is larger than the sum of its proper divisors (1747).

89729 is a wasteful number, since it uses less digits than its factorization.

89729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746.

The product of its digits is 9072, while the sum is 35.

The square root of 89729 is about 299.5479928158. The cubic root of 89729 is about 44.7690222179.

It can be divided in two parts, 89 and 729, that added together give a palindrome (818).

The spelling of 89729 in words is "eighty-nine thousand, seven hundred twenty-nine".