15728 has 10 divisors (see below), whose sum is σ = 30504. Its totient is φ = 7856.

The previous prime is 15727. The next prime is 15731. The reversal of 15728 is 82751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 476 + ... + 507.

2¹⁵⁷²⁸ is an apocalyptic number.

It is an amenable number.

15728 is a deficient number, since it is larger than the sum of its proper divisors (14776).

15728 is an equidigital number, since it uses as much as digits as its factorization.

15728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 985 counting only the distinct ones).

The product of its digits is 560, while the sum is 23.

The square root of 15728 is about 125.4113232527. The cubic root of 15728 is about 25.0548130666.

Adding to 15728 its sum of digits (23), we get a palindrome (15751).

The spelling of 15728 in words is "fifteen thousand, seven hundred twenty-eight".