11428 has 6 divisors (see below), whose sum is σ = 20006. Its totient is φ = 5712.

The previous prime is 11423. The next prime is 11437. The reversal of 11428 is 82411.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10404 + 1024 = 102^2 + 32^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (11423) by changing a digit.

11428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1425 + ... + 1432.

2¹¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

11428 is a deficient number, since it is larger than the sum of its proper divisors (8578).

11428 is a wasteful number, since it uses less digits than its factorization.

11428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2861 (or 2859 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 11428 is about 106.9018241191. The cubic root of 11428 is about 22.5245821867.

Adding to 11428 its reverse (82411), we get a palindrome (93839).

The spelling of 11428 in words is "eleven thousand, four hundred twenty-eight".