8721744 has 40 divisors (see below), whose sum is σ = 22751520. Its totient is φ = 2878848.

The previous prime is 8721737. The next prime is 8721749. The reversal of 8721744 is 4471278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4399 + ... + 6065.

It is an arithmetic number, because the mean of its divisors is an integer number (568788).

Almost surely, 2^8721744 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 8721744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11375760).

8721744 is an abundant number, since it is smaller than the sum of its proper divisors (14029776).

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

8721744 is a wasteful number, since it uses less digits than its factorization.

8721744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787 (or 1781 counting only the distinct ones).

The product of its digits is 12544, while the sum is 33.

The square root of 8721744 is about 2953.2598937445. The cubic root of 8721744 is about 205.8422142992.

The spelling of 8721744 in words is "eight million, seven hundred twenty-one thousand, seven hundred forty-four".