1091767680 has 512 divisors, whose sum is σ = 4194892800. Its totient is φ = 267632640.

The previous prime is 1091767667. The next prime is 1091767687. The reversal of 1091767680 is 867671901.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091767687) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16295007 + ... + 16295073.

It is an arithmetic number, because the mean of its divisors is an integer number (8193150).

Almost surely, 2^1091767680 is an apocalyptic number.

1091767680 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 1091767680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2097446400).

1091767680 is an abundant number, since it is smaller than the sum of its proper divisors (3103125120).

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

1091767680 is a wasteful number, since it uses less digits than its factorization.

1091767680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 1091767680 is about 33041.9079352267. The cubic root of 1091767680 is about 1029.6984947151.

The spelling of 1091767680 in words is "one billion, ninety-one million, seven hundred sixty-seven thousand, six hundred eighty".