7428728 has 16 divisors (see below), whose sum is σ = 14748480. Its totient is φ = 3495808.

The previous prime is 7428713. The next prime is 7428731. The reversal of 7428728 is 8278247.

It is a junction number, because it is equal to n+sod(n) for n = 7428691 and 7428700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27176 + ... + 27447.

It is an arithmetic number, because the mean of its divisors is an integer number (921780).

Almost surely, 2^7428728 is an apocalyptic number.

It is an amenable number.

7428728 is a deficient number, since it is larger than the sum of its proper divisors (7319752).

7428728 is a wasteful number, since it uses less digits than its factorization.

7428728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54646 (or 54642 counting only the distinct ones).

The product of its digits is 50176, while the sum is 38.

The square root of 7428728 is about 2725.5692983302. The cubic root of 7428728 is about 195.1213621029.

The spelling of 7428728 in words is "seven million, four hundred twenty-eight thousand, seven hundred twenty-eight".