8720872 has 32 divisors (see below), whose sum is σ = 16849800. Its totient is φ = 4230144.

The previous prime is 8720839. The next prime is 8720891. The reversal of 8720872 is 2780278.

It can be written as a sum of positive squares in 4 ways, for example, as 8328996 + 391876 = 2886^2 + 626^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63588 + ... + 63724.

Almost surely, 2^8720872 is an apocalyptic number.

It is an amenable number.

8720872 is a deficient number, since it is larger than the sum of its proper divisors (8128928).

8720872 is a wasteful number, since it uses less digits than its factorization.

8720872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 8720872 is about 2953.1122565863. The cubic root of 8720872 is about 205.8353540354.

The spelling of 8720872 in words is "eight million, seven hundred twenty thousand, eight hundred seventy-two".