8721408 has 88 divisors (see below), whose sum is σ = 24760512. Its totient is φ = 2719744.

The previous prime is 8721403. The next prime is 8721413. The reversal of 8721408 is 8041278.

It is an interprime number because it is at equal distance from previous prime (8721403) and next prime (8721413).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52141 + ... + 52307.

Almost surely, 2^8721408 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 8721408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12380256).

8721408 is an abundant number, since it is smaller than the sum of its proper divisors (16039104).

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

8721408 is a wasteful number, since it uses less digits than its factorization.

8721408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 8721408 is about 2953.2030069062. The cubic root of 8721408 is about 205.8395709489.

The spelling of 8721408 in words is "eight million, seven hundred twenty-one thousand, four hundred eight".