1125809280 has 448 divisors, whose sum is σ = 4281062400. Its totient is φ = 282175488.

The previous prime is 1125809263. The next prime is 1125809287. The reversal of 1125809280 is 829085211.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1125809287) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 8864577 + ... + 8864703.

Almost surely, 2^1125809280 is an apocalyptic number.

1125809280 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 1125809280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2140531200).

1125809280 is an abundant number, since it is smaller than the sum of its proper divisors (3155253120).

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

1125809280 is an equidigital number, since it uses as much as digits as its factorization.

1125809280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1125809280 is about 33553.0815276332. The cubic root of 1125809280 is about 1040.2912399330.

The spelling of 1125809280 in words is "one billion, one hundred twenty-five million, eight hundred nine thousand, two hundred eighty".