1081985268 has 192 divisors, whose sum is σ = 3225689600. Its totient is φ = 280433664.

The previous prime is 1081985257. The next prime is 1081985269. The reversal of 1081985268 is 8625891801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081985269) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3905946 + ... + 3906222.

Almost surely, 2^1081985268 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 1081985268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612844800).

1081985268 is an abundant number, since it is smaller than the sum of its proper divisors (2143704332).

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

1081985268 is a wasteful number, since it uses less digits than its factorization.

1081985268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 48.

The square root of 1081985268 is about 32893.5444730421. The cubic root of 1081985268 is about 1026.6138425530.

The spelling of 1081985268 in words is "one billion, eighty-one million, nine hundred eighty-five thousand, two hundred sixty-eight".