8987729 has 4 divisors (see below), whose sum is σ = 9080484. Its totient is φ = 8894976.

The previous prime is 8987723. The next prime is 8987749. The reversal of 8987729 is 9277898.

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 5664400 + 3323329 = 2380^2 + 1823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8987729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8987723) 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, 46232 + ... + 46425.

It is an arithmetic number, because the mean of its divisors is an integer number (2270121).

Almost surely, 2^8987729 is an apocalyptic number.

It is an amenable number.

8987729 is a deficient number, since it is larger than the sum of its proper divisors (92755).

8987729 is an equidigital number, since it uses as much as digits as its factorization.

8987729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92754.

The product of its digits is 508032, while the sum is 50.

The square root of 8987729 is about 2997.9541357399. The cubic root of 8987729 is about 207.9138033500.

The spelling of 8987729 in words is "eight million, nine hundred eighty-seven thousand, seven hundred twenty-nine".