7288889 has 8 divisors (see below), whose sum is σ = 7745160. Its totient is φ = 6846336.

The previous prime is 7288877. The next prime is 7288891. The reversal of 7288889 is 9888827.

It can be written as a sum of positive squares in 4 ways, for example, as 1123600 + 6165289 = 1060^2 + 2483^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7288889 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7288819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324 + ... + 4469.

It is an arithmetic number, because the mean of its divisors is an integer number (968145).

Almost surely, 2^7288889 is an apocalyptic number.

It is an amenable number.

7288889 is a deficient number, since it is larger than the sum of its proper divisors (456271).

7288889 is a wasteful number, since it uses less digits than its factorization.

7288889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6859.

The product of its digits is 516096, while the sum is 50.

The square root of 7288889 is about 2699.7942514199. The cubic root of 7288889 is about 193.8892714916.

The spelling of 7288889 in words is "seven million, two hundred eighty-eight thousand, eight hundred eighty-nine".