1091405568 has 288 divisors, whose sum is σ = 3411942912. Its totient is φ = 306380800.

The previous prime is 1091405551. The next prime is 1091405573. The reversal of 1091405568 is 8655041901.

It is a super-2 number, since 2×1091405568² = 2382332227722805248, which contains 22 as substring.

It is a congruent number.

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, 7966396 + ... + 7966532.

It is an arithmetic number, because the mean of its divisors is an integer number (11847024).

Almost surely, 2^1091405568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091405568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705971456).

1091405568 is an abundant number, since it is smaller than the sum of its proper divisors (2320537344).

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

1091405568 is a wasteful number, since it uses less digits than its factorization.

1091405568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 1091405568 is about 33036.4278940687. The cubic root of 1091405568 is about 1029.5846403914.

The spelling of 1091405568 in words is "one billion, ninety-one million, four hundred five thousand, five hundred sixty-eight".