1081313280 has 192 divisors, whose sum is σ = 3844713600. Its totient is φ = 288276480.

The previous prime is 1081313273. The next prime is 1081313291. The reversal of 1081313280 is 823131801.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274525 + ... + 278435.

It is an arithmetic number, because the mean of its divisors is an integer number (20024550).

Almost surely, 2^1081313280 is an apocalyptic number.

1081313280 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 1081313280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922356800).

1081313280 is an abundant number, since it is smaller than the sum of its proper divisors (2763400320).

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

1081313280 is an equidigital number, since it uses as much as digits as its factorization.

1081313280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947 (or 3921 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1081313280 is about 32883.3282986987. The cubic root of 1081313280 is about 1026.4012657056.

The spelling of 1081313280 in words is "one billion, eighty-one million, three hundred thirteen thousand, two hundred eighty".