8721244 has 12 divisors (see below), whose sum is σ = 17442544. Its totient is φ = 3737664.

The previous prime is 8721239. The next prime is 8721253. The reversal of 8721244 is 4421278.

8721244 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 311473 = 8721244 / (8 + 7 + 2 + 1 + 2 + 4 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155709 + ... + 155764.

Almost surely, 2^8721244 is an apocalyptic number.

It is an amenable number.

8721244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8721244 is a wasteful number, since it uses less digits than its factorization.

8721244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311484 (or 311482 counting only the distinct ones).

The product of its digits is 3584, while the sum is 28.

The square root of 8721244 is about 2953.1752403134. The cubic root of 8721244 is about 205.8382807176.

It can be divided in two parts, 872 and 1244, that added together give a square (2116 = 46²).

The spelling of 8721244 in words is "eight million, seven hundred twenty-one thousand, two hundred forty-four".