13553728 has 14 divisors (see below), whose sum is σ = 26895806. Its totient is φ = 6776832.

The previous prime is 13553723. The next prime is 13553731. The reversal of 13553728 is 82735531.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 937024 = 3552^2 + 968^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13553693 and 13553702.

It is not an unprimeable number, because it can be changed into a prime (13553723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105825 + ... + 105952.

It is an arithmetic number, because the mean of its divisors is an integer number (1921129).

Almost surely, 2^13553728 is an apocalyptic number.

It is an amenable number.

13553728 is a deficient number, since it is larger than the sum of its proper divisors (13342078).

13553728 is an equidigital number, since it uses as much as digits as its factorization.

13553728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211789 (or 211779 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 13553728 is about 3681.5388087049. The cubic root of 13553728 is about 238.4256207169.

The spelling of 13553728 in words is "thirteen million, five hundred fifty-three thousand, seven hundred twenty-eight".