13129728 has 48 divisors (see below), whose sum is σ = 35020440. Its totient is φ = 4374528.

The previous prime is 13129693. The next prime is 13129747. The reversal of 13129728 is 82792131.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

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, 5076 + ... + 7212.

Almost surely, 2^13129728 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 13129728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17510220).

13129728 is an abundant number, since it is smaller than the sum of its proper divisors (21890712).

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

13129728 is an equidigital number, since it uses as much as digits as its factorization.

13129728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162 (or 2142 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 13129728 is about 3623.4966537862. The cubic root of 13129728 is about 235.9130197515.

The spelling of 13129728 in words is "thirteen million, one hundred twenty-nine thousand, seven hundred twenty-eight".