13447728 has 80 divisors (see below), whose sum is σ = 44124160. Its totient is φ = 3841344.

The previous prime is 13447717. The next prime is 13447729. The reversal of 13447728 is 82774431.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 13447692 and 13447701.

It is not an unprimeable number, because it can be changed into a prime (13447729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801 + ... + 5247.

It is an arithmetic number, because the mean of its divisors is an integer number (551552).

Almost surely, 2^13447728 is an apocalyptic number.

13447728 is a gapful number since it is divisible by the number (18) 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 13447728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22062080).

13447728 is an abundant number, since it is smaller than the sum of its proper divisors (30676432).

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

13447728 is a wasteful number, since it uses less digits than its factorization.

13447728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471 (or 4459 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 13447728 is about 3667.1143969066. The cubic root of 13447728 is about 237.8024394474.

The spelling of 13447728 in words is "thirteen million, four hundred forty-seven thousand, seven hundred twenty-eight".