8721706 has 12 divisors (see below), whose sum is σ = 15218658. Its totient is φ = 3737832.

The previous prime is 8721701. The next prime is 8721737. The reversal of 8721706 is 6071278.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6456681 + 2265025 = 2541^2 + 1505^2 .

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (8721701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44401 + ... + 44596.

Almost surely, 2^8721706 is an apocalyptic number.

8721706 is a deficient number, since it is larger than the sum of its proper divisors (6496952).

8721706 is a wasteful number, since it uses less digits than its factorization.

8721706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89013 (or 89006 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 8721706 is about 2953.2534601690. The cubic root of 8721706 is about 205.8419153522.

The spelling of 8721706 in words is "eight million, seven hundred twenty-one thousand, seven hundred six".