7216128 has 132 divisors (see below), whose sum is σ = 22353240. Its totient is φ = 2322432.

The previous prime is 7216091. The next prime is 7216129. The reversal of 7216128 is 8216127.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (1344) is a multiple of the sum of its prime factors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248818 + ... + 248846.

Almost surely, 2^7216128 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 7216128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11176620).

7216128 is an abundant number, since it is smaller than the sum of its proper divisors (15137112).

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

7216128 is an equidigital number, since it uses as much as digits as its factorization.

7216128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 34 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 7216128 is about 2686.2851672896. The cubic root of 7216128 is about 193.2419491488.

Subtracting 7216128 from its reverse (8216127), we obtain a palindrome (999999).

The spelling of 7216128 in words is "seven million, two hundred sixteen thousand, one hundred twenty-eight".