8721736 has 8 divisors (see below), whose sum is σ = 16353270. Its totient is φ = 4360864.

The previous prime is 8721701. The next prime is 8721737. The reversal of 8721736 is 6371278.

It can be written as a sum of positive squares in only one way, i.e., 7257636 + 1464100 = 2694^2 + 1210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (8721737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545101 + ... + 545116.

Almost surely, 2^8721736 is an apocalyptic number.

It is an amenable number.

8721736 is a deficient number, since it is larger than the sum of its proper divisors (7631534).

8721736 is a wasteful number, since it uses less digits than its factorization.

8721736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090223 (or 1090219 counting only the distinct ones).

The product of its digits is 14112, while the sum is 34.

The square root of 8721736 is about 2953.2585393087. The cubic root of 8721736 is about 205.8421513630.

The spelling of 8721736 in words is "eight million, seven hundred twenty-one thousand, seven hundred thirty-six".