1128564 has 72 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 340032.

The previous prime is 1128557. The next prime is 1128577. The reversal of 1128564 is 4658211.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23989 + ... + 24035.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2^1128564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1128564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572480).

1128564 is an abundant number, since it is smaller than the sum of its proper divisors (2016396).

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

1128564 is a wasteful number, since it uses less digits than its factorization.

1128564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 104 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1128564 is about 1062.3389289676. The cubic root of 1128564 is about 104.1139038033.

The spelling of 1128564 in words is "one million, one hundred twenty-eight thousand, five hundred sixty-four".