8721072 has 60 divisors (see below), whose sum is σ = 24779664. Its totient is φ = 2862720.

The previous prime is 8721061. The next prime is 8721077. The reversal of 8721072 is 2701278.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (8721077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9798 + ... + 10650.

Almost surely, 2^8721072 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 8721072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12389832).

8721072 is an abundant number, since it is smaller than the sum of its proper divisors (16058592).

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

8721072 is a wasteful number, since it uses less digits than its factorization.

8721072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 8721072 is about 2953.1461189721. The cubic root of 8721072 is about 205.8369275308.

The spelling of 8721072 in words is "eight million, seven hundred twenty-one thousand, seventy-two".