13728724 has 12 divisors (see below), whose sum is σ = 25438644. Its totient is φ = 6460544.

The previous prime is 13728713. The next prime is 13728731. The reversal of 13728724 is 42782731.

13728724 = T₄₆₇ + T₄₆₈ + ... + T₅₆₈.

It can be written as a sum of positive squares in 2 ways, for example, as 5143824 + 8584900 = 2268^2 + 2930^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 13728724.

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, 100879 + ... + 101014.

It is an arithmetic number, because the mean of its divisors is an integer number (2119887).

Almost surely, 2^13728724 is an apocalyptic number.

It is an amenable number.

13728724 is a deficient number, since it is larger than the sum of its proper divisors (11709920).

13728724 is a wasteful number, since it uses less digits than its factorization.

13728724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201914 (or 201912 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 13728724 is about 3705.2292776561. The cubic root of 13728724 is about 239.4473627027.

The spelling of 13728724 in words is "thirteen million, seven hundred twenty-eight thousand, seven hundred twenty-four".