13457728 has 14 divisors (see below), whose sum is σ = 26705306. Its totient is φ = 6728832.

The previous prime is 13457713. The next prime is 13457747. The reversal of 13457728 is 82775431.

It can be written as a sum of positive squares in only one way, i.e., 10188864 + 3268864 = 3192^2 + 1808^2 .

It is a super-2 number, since 2×13457728² = 362220885843968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105075 + ... + 105202.

Almost surely, 2^13457728 is an apocalyptic number.

It is an amenable number.

13457728 is a deficient number, since it is larger than the sum of its proper divisors (13247578).

13457728 is an equidigital number, since it uses as much as digits as its factorization.

13457728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210289 (or 210279 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 13457728 is about 3668.4776133977. The cubic root of 13457728 is about 237.8613697288.

The spelling of 13457728 in words is "thirteen million, four hundred fifty-seven thousand, seven hundred twenty-eight".