8602721 has 4 divisors (see below), whose sum is σ = 8621844. Its totient is φ = 8583600.

The previous prime is 8602703. The next prime is 8602729. The reversal of 8602721 is 1272068.

8602721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 1638400 + 6964321 = 1280^2 + 2639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8602721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8602729) 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, 8870 + ... + 9791.

It is an arithmetic number, because the mean of its divisors is an integer number (2155461).

Almost surely, 2^8602721 is an apocalyptic number.

It is an amenable number.

8602721 is a deficient number, since it is larger than the sum of its proper divisors (19123).

8602721 is a wasteful number, since it uses less digits than its factorization.

8602721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19122.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 8602721 is about 2933.0395496822. The cubic root of 8602721 is about 204.9015668623.

Adding to 8602721 its reverse (1272068), we get a palindrome (9874789).

The spelling of 8602721 in words is "eight million, six hundred two thousand, seven hundred twenty-one".