7279728 has 40 divisors (see below), whose sum is σ = 19248768. Its totient is φ = 2369472.

The previous prime is 7279691. The next prime is 7279729. The reversal of 7279728 is 8279727.

It is a self number, because there is not a number n which added to its sum of digits gives 7279728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7279729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301 + ... + 3827.

Almost surely, 2^7279728 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 7279728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9624384).

7279728 is an abundant number, since it is smaller than the sum of its proper divisors (11969040).

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

7279728 is a wasteful number, since it uses less digits than its factorization.

7279728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581 (or 3575 counting only the distinct ones).

The product of its digits is 98784, while the sum is 42.

The square root of 7279728 is about 2698.0971072221. The cubic root of 7279728 is about 193.8080078824.

Subtracting 7279728 from its reverse (8279727), we obtain a palindrome (999999).

It can be divided in two parts, 72 and 79728, that added together give a triangular number (79800 = T₃₉₉).

The spelling of 7279728 in words is "seven million, two hundred seventy-nine thousand, seven hundred twenty-eight".