1109640680 has 16 divisors (see below), whose sum is σ = 2496691620. Its totient is φ = 443856256.

The previous prime is 1109640673. The next prime is 1109640683. The reversal of 1109640680 is 860469011.

It can be written as a sum of positive squares in 2 ways, for example, as 1073086564 + 36554116 = 32758^2 + 6046^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1109640680.

It is not an unprimeable number, because it can be changed into a prime (1109640683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13870469 + ... + 13870548.

Almost surely, 2^1109640680 is an apocalyptic number.

1109640680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1109640680 is an abundant number, since it is smaller than the sum of its proper divisors (1387050940).

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

1109640680 is a wasteful number, since it uses less digits than its factorization.

1109640680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27741028 (or 27741024 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1109640680 is about 33311.2695645183. The cubic root of 1109640680 is about 1035.2870698176.

The spelling of 1109640680 in words is "one billion, one hundred nine million, six hundred forty thousand, six hundred eighty".