7289728 has 16 divisors (see below), whose sum is σ = 14522760. Its totient is φ = 3644800.

The previous prime is 7289713. The next prime is 7289729. The reversal of 7289728 is 8279827.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7289729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28348 + ... + 28603.

Almost surely, 2^7289728 is an apocalyptic number.

It is an amenable number.

7289728 is a deficient number, since it is larger than the sum of its proper divisors (7233032).

7289728 is an equidigital number, since it uses as much as digits as its factorization.

7289728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56965 (or 56953 counting only the distinct ones).

The product of its digits is 112896, while the sum is 43.

The square root of 7289728 is about 2699.9496291598. The cubic root of 7289728 is about 193.8967105246.

Subtracting 7289728 from its reverse (8279827), we obtain a palindrome (990099).

The spelling of 7289728 in words is "seven million, two hundred eighty-nine thousand, seven hundred twenty-eight".