13449728 has 40 divisors (see below), whose sum is σ = 27232260. Its totient is φ = 6635520.

The previous prime is 13449727. The next prime is 13449749. The reversal of 13449728 is 82794431.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 719104 = 3568^2 + 848^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13449691 and 13449700.

It is not an unprimeable number, because it can be changed into a prime (13449727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55688 + ... + 55928.

Almost surely, 2^13449728 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 13449728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13616130).

13449728 is an abundant number, since it is smaller than the sum of its proper divisors (13782532).

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

13449728 is an equidigital number, since it uses as much as digits as its factorization.

13449728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 352 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 13449728 is about 3667.3870807429. The cubic root of 13449728 is about 237.8142278402.

The spelling of 13449728 in words is "thirteen million, four hundred forty-nine thousand, seven hundred twenty-eight".