1128880 has 40 divisors (see below), whose sum is σ = 2669472. Its totient is φ = 443904.

The previous prime is 1128823. The next prime is 1128889. The reversal of 1128880 is 888211.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1128889) 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, 8172 + ... + 8308.

2^1128880 is an apocalyptic number.

1128880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1128880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1334736).

1128880 is an abundant number, since it is smaller than the sum of its proper divisors (1540592).

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

1128880 is a wasteful number, since it uses less digits than its factorization.

1128880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 1128880 is about 1062.4876469870. The cubic root of 1128880 is about 104.1236202582.

It can be divided in two parts, 1 and 128880, that added together give a square (128881 = 359²).

The spelling of 1128880 in words is "one million, one hundred twenty-eight thousand, eight hundred eighty".