11128820 has 12 divisors (see below), whose sum is σ = 23370564. Its totient is φ = 4451520.

The previous prime is 11128811. The next prime is 11128853. The reversal of 11128820 is 2882111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1752976 + 9375844 = 1324^2 + 3062^2 .

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278201 + ... + 278240.

It is an arithmetic number, because the mean of its divisors is an integer number (1947547).

Almost surely, 2^11128820 is an apocalyptic number.

11128820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11128820 is an abundant number, since it is smaller than the sum of its proper divisors (12241744).

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

11128820 is a wasteful number, since it uses less digits than its factorization.

11128820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556450 (or 556448 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 11128820 is about 3335.9886090933. The cubic root of 11128820 is about 223.2628029059.

The spelling of 11128820 in words is "eleven million, one hundred twenty-eight thousand, eight hundred twenty".