13228816 has 40 divisors (see below), whose sum is σ = 26784000. Its totient is φ = 6322560.

The previous prime is 13228801. The next prime is 13228819. The reversal of 13228816 is 61882231.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (13228819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73815 + ... + 73993.

It is an arithmetic number, because the mean of its divisors is an integer number (669600).

Almost surely, 2^13228816 is an apocalyptic number.

13228816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13228816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13392000).

13228816 is an abundant number, since it is smaller than the sum of its proper divisors (13555184).

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

13228816 is a wasteful number, since it uses less digits than its factorization.

13228816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 361 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 13228816 is about 3637.1439344629. The cubic root of 13228816 is about 236.5049992462.

The spelling of 13228816 in words is "thirteen million, two hundred twenty-eight thousand, eight hundred sixteen".