1081817856 has 360 divisors, whose sum is σ = 3828575520. Its totient is φ = 297271296.

The previous prime is 1081817843. The next prime is 1081817887. The reversal of 1081817856 is 6587181801.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4209280 + ... + 4209536.

It is an arithmetic number, because the mean of its divisors is an integer number (10634932).

Almost surely, 2^1081817856 is an apocalyptic number.

1081817856 is a gapful number since it is divisible by the number (16) 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 1081817856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1914287760).

1081817856 is an abundant number, since it is smaller than the sum of its proper divisors (2746757664).

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

1081817856 is an equidigital number, since it uses as much as digits as its factorization.

1081817856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 45.

The square root of 1081817856 is about 32890.9996199568. Note that the first 3 decimals coincide. The cubic root of 1081817856 is about 1026.5608916344.

The spelling of 1081817856 in words is "one billion, eighty-one million, eight hundred seventeen thousand, eight hundred fifty-six".