8721344 has 56 divisors (see below), whose sum is σ = 18531840. Its totient is φ = 4064256.

The previous prime is 8721329. The next prime is 8721359. The reversal of 8721344 is 4431278.

It is an interprime number because it is at equal distance from previous prime (8721329) and next prime (8721359).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

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, 68609 + ... + 68735.

Almost surely, 2^8721344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8721344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9265920).

8721344 is an abundant number, since it is smaller than the sum of its proper divisors (9810496).

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

8721344 is a wasteful number, since it uses less digits than its factorization.

8721344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 195 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 8721344 is about 2953.1921711937. The cubic root of 8721344 is about 205.8390674459.

The spelling of 8721344 in words is "eight million, seven hundred twenty-one thousand, three hundred forty-four".