7920128 has 40 divisors (see below), whose sum is σ = 16368000. Its totient is φ = 3824640.

The previous prime is 7920091. The next prime is 7920139. The reversal of 7920128 is 8210297.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7920128.

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, 15623 + ... + 16121.

It is an arithmetic number, because the mean of its divisors is an integer number (409200).

Almost surely, 2^7920128 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 7920128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8184000).

7920128 is an abundant number, since it is smaller than the sum of its proper divisors (8447872).

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

7920128 is an equidigital number, since it uses as much as digits as its factorization.

7920128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 7920128 is about 2814.2721972119. The cubic root of 7920128 is about 199.3321725143.

The spelling of 7920128 in words is "seven million, nine hundred twenty thousand, one hundred twenty-eight".