1085863680 has 648 divisors, whose sum is σ = 4452935760. Its totient is φ = 243302400.

The previous prime is 1085863663. The next prime is 1085863693. The reversal of 1085863680 is 863685801.

1085863680 is a `hidden beast` number, since 1 + 0 + 8 + 5 + 8 + 636 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 26484460 + ... + 26484500.

Almost surely, 2^1085863680 is an apocalyptic number.

1085863680 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 1085863680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2226467880).

1085863680 is an abundant number, since it is smaller than the sum of its proper divisors (3367072080).

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

1085863680 is a wasteful number, since it uses less digits than its factorization.

1085863680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1085863680 is about 32952.4457362424. The cubic root of 1085863680 is about 1027.8390235807.

The spelling of 1085863680 in words is "one billion, eighty-five million, eight hundred sixty-three thousand, six hundred eighty".