11531028 has 24 divisors (see below), whose sum is σ = 26968032. Its totient is φ = 3834784.

The previous prime is 11531021. The next prime is 11531029. The reversal of 11531028 is 82013511.

It is a junction number, because it is equal to n+sod(n) for n = 11530995 and 11531013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6226 + ... + 7862.

It is an arithmetic number, because the mean of its divisors is an integer number (1123668).

Almost surely, 2^11531028 is an apocalyptic number.

It is an amenable number.

11531028 is an abundant number, since it is smaller than the sum of its proper divisors (15437004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11531028 is a wasteful number, since it uses less digits than its factorization.

11531028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231 (or 2229 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 11531028 is about 3395.7367389125. The cubic root of 11531028 is about 225.9206916230.

Adding to 11531028 its reverse (82013511), we get a palindrome (93544539).

The spelling of 11531028 in words is "eleven million, five hundred thirty-one thousand, twenty-eight".