7249728 has 56 divisors (see below), whose sum is σ = 19527520. Its totient is φ = 2373120.

The previous prime is 7249727. The next prime is 7249729. The reversal of 7249728 is 8279427.

7249728 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7249727) and next prime (7249729).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7249727) 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, 11403 + ... + 12021.

Almost surely, 2^7249728 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 7249728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9763760).

7249728 is an abundant number, since it is smaller than the sum of its proper divisors (12277792).

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

7249728 is a wasteful number, since it uses less digits than its factorization.

7249728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 685 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 7249728 is about 2692.5318939615. The cubic root of 7249728 is about 193.5414115909.

The spelling of 7249728 in words is "seven million, two hundred forty-nine thousand, seven hundred twenty-eight".