7288721 has 8 divisors (see below), whose sum is σ = 8025600. Its totient is φ = 6564240.

The previous prime is 7288711. The next prime is 7288727. The reversal of 7288721 is 1278827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7288721 - 2¹⁴ = 7272337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7288727) 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, 1841 + ... + 4238.

It is an arithmetic number, because the mean of its divisors is an integer number (1003200).

Almost surely, 2^7288721 is an apocalyptic number.

It is an amenable number.

7288721 is a deficient number, since it is larger than the sum of its proper divisors (736879).

7288721 is a wasteful number, since it uses less digits than its factorization.

7288721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6199.

The product of its digits is 12544, while the sum is 35.

The square root of 7288721 is about 2699.7631377586. The cubic root of 7288721 is about 193.8877818431.

It can be divided in two parts, 728 and 8721, that added together give a palindrome (9449).

The spelling of 7288721 in words is "seven million, two hundred eighty-eight thousand, seven hundred twenty-one".