1081688648 has 16 divisors (see below), whose sum is σ = 2147470380. Its totient is φ = 509029888.

The previous prime is 1081688627. The next prime is 1081688653. The reversal of 1081688648 is 8468861801.

It can be written as a sum of positive squares in 2 ways, for example, as 1049630404 + 32058244 = 32398^2 + 5662^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1081688596 and 1081688605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3976661 + ... + 3976932.

Almost surely, 2^1081688648 is an apocalyptic number.

It is an amenable number.

1081688648 is a deficient number, since it is larger than the sum of its proper divisors (1065781732).

1081688648 is a wasteful number, since it uses less digits than its factorization.

1081688648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7953616 (or 7953612 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 50.

The square root of 1081688648 is about 32889.0353765506. The cubic root of 1081688648 is about 1026.5200205642.

The spelling of 1081688648 in words is "one billion, eighty-one million, six hundred eighty-eight thousand, six hundred forty-eight".