1091742720 has 352 divisors, whose sum is σ = 3830804928. Its totient is φ = 264241152.

The previous prime is 1091742697. The next prime is 1091742731. The reversal of 1091742720 is 272471901.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9661384 + ... + 9661496.

Almost surely, 2^1091742720 is an apocalyptic number.

1091742720 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 1091742720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1915402464).

1091742720 is an abundant number, since it is smaller than the sum of its proper divisors (2739062208).

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

1091742720 is a wasteful number, since it uses less digits than its factorization.

1091742720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 1091742720 is about 33041.5302309079. The cubic root of 1091742720 is about 1029.6906476640.

The spelling of 1091742720 in words is "one billion, ninety-one million, seven hundred forty-two thousand, seven hundred twenty".