7728128 has 22 divisors (see below), whose sum is σ = 15450756. Its totient is φ = 3863552.

The previous prime is 7728121. The next prime is 7728139. The reversal of 7728128 is 8218277.

It is not an unprimeable number, because it can be changed into a prime (7728121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2750 + ... + 4797.

Almost surely, 2^7728128 is an apocalyptic number.

It is an amenable number.

7728128 is a deficient number, since it is larger than the sum of its proper divisors (7722628).

7728128 is an equidigital number, since it uses as much as digits as its factorization.

7728128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7567 (or 7549 counting only the distinct ones).

The product of its digits is 12544, while the sum is 35.

The square root of 7728128 is about 2779.9510787062. The cubic root of 7728128 is about 197.7082394744.

The spelling of 7728128 in words is "seven million, seven hundred twenty-eight thousand, one hundred twenty-eight".