8721324 has 48 divisors (see below), whose sum is σ = 23600640. Its totient is φ = 2779920.

The previous prime is 8721313. The next prime is 8721329. The reversal of 8721324 is 4231278.

It is a super-2 number, since 2×8721324² = 152122984625952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (8721329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729 + ... + 4239.

It is an arithmetic number, because the mean of its divisors is an integer number (491680).

Almost surely, 2^8721324 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 8721324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11800320).

8721324 is an abundant number, since it is smaller than the sum of its proper divisors (14879316).

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

8721324 is a wasteful number, since it uses less digits than its factorization.

8721324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547 (or 3539 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 8721324 is about 2953.1887850254. The cubic root of 8721324 is about 205.8389101008.

It can be divided in two parts, 8721 and 324, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 8721324 in words is "eight million, seven hundred twenty-one thousand, three hundred twenty-four".