7481728 has 16 divisors (see below), whose sum is σ = 14905260. Its totient is φ = 3740800.

The previous prime is 7481723. The next prime is 7481753. The reversal of 7481728 is 8271847.

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

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7481723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29098 + ... + 29353.

Almost surely, 2^7481728 is an apocalyptic number.

It is an amenable number.

7481728 is a deficient number, since it is larger than the sum of its proper divisors (7423532).

7481728 is an equidigital number, since it uses as much as digits as its factorization.

7481728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58465 (or 58453 counting only the distinct ones).

The product of its digits is 25088, while the sum is 37.

The square root of 7481728 is about 2735.2747576797. The cubic root of 7481728 is about 195.5842917673.

The spelling of 7481728 in words is "seven million, four hundred eighty-one thousand, seven hundred twenty-eight".