1091968660 has 24 divisors (see below), whose sum is σ = 2346464736. Its totient is φ = 426629280.

The previous prime is 1091968601. The next prime is 1091968687. The reversal of 1091968660 is 668691901.

It is a self number, because there is not a number n which added to its sum of digits gives 1091968660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634006 + ... + 635725.

It is an arithmetic number, because the mean of its divisors is an integer number (97769364).

Almost surely, 2^1091968660 is an apocalyptic number.

1091968660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091968660 is an abundant number, since it is smaller than the sum of its proper divisors (1254496076).

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

1091968660 is a wasteful number, since it uses less digits than its factorization.

1091968660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269783 (or 1269781 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1091968660 is about 33044.9490845424. The cubic root of 1091968660 is about 1029.7616754661.

The spelling of 1091968660 in words is "one billion, ninety-one million, nine hundred sixty-eight thousand, six hundred sixty".