89731729 has 4 divisors (see below), whose sum is σ = 95010084. Its totient is φ = 84453376.

The previous prime is 89731711. The next prime is 89731751. The reversal of 89731729 is 92713798.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50794129 + 38937600 = 7127^2 + 6240^2 .

It is a cyclic number.

It is not a de Polignac number, because 89731729 - 2¹⁷ = 89600657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89731769) 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, 2639152 + ... + 2639185.

It is an arithmetic number, because the mean of its divisors is an integer number (23752521).

Almost surely, 2^89731729 is an apocalyptic number.

It is an amenable number.

89731729 is a deficient number, since it is larger than the sum of its proper divisors (5278355).

89731729 is a wasteful number, since it uses less digits than its factorization.

89731729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278354.

The product of its digits is 190512, while the sum is 46.

The square root of 89731729 is about 9472.6833051675. The cubic root of 89731729 is about 447.6947607864.

The spelling of 89731729 in words is "eighty-nine million, seven hundred thirty-one thousand, seven hundred twenty-nine".