1089311688 has 96 divisors (see below), whose sum is σ = 3061913400. Its totient is φ = 349440000.

The previous prime is 1089311683. The next prime is 1089311689. The reversal of 1089311688 is 8861139801.

It can be written as a sum of positive squares in 4 ways, for example, as 915546564 + 173765124 = 30258^2 + 13182^2 .

It is a super-2 number, since 2×1089311688² = 2373199907226818688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1089311683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 836638 + ... + 837938.

Almost surely, 2^1089311688 is an apocalyptic number.

1089311688 is a gapful number since it is divisible by the number (18) 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 1089311688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530956700).

1089311688 is an abundant number, since it is smaller than the sum of its proper divisors (1972601712).

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

1089311688 is a wasteful number, since it uses less digits than its factorization.

1089311688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1089311688 is about 33004.7222075872. The cubic root of 1089311688 is about 1028.9257937064.

The spelling of 1089311688 in words is "one billion, eighty-nine million, three hundred eleven thousand, six hundred eighty-eight".