1091783664 has 40 divisors (see below), whose sum is σ = 3133824720. Its totient is φ = 363927744.

The previous prime is 1091783663. The next prime is 1091783687. The reversal of 1091783664 is 4663871901.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091783663) 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 7 ways as a sum of consecutive naturals, for example, 1263207 + ... + 1264070.

It is an arithmetic number, because the mean of its divisors is an integer number (78345618).

Almost surely, 2^1091783664 is an apocalyptic number.

It is an amenable number.

1091783664 is an abundant number, since it is smaller than the sum of its proper divisors (2042041056).

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

1091783664 is a wasteful number, since it uses less digits than its factorization.

1091783664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527294 (or 2527282 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1091783664 is about 33042.1498089940. The cubic root of 1091783664 is about 1029.7035197830.

The spelling of 1091783664 in words is "one billion, ninety-one million, seven hundred eighty-three thousand, six hundred sixty-four".