1099776720 has 80 divisors (see below), whose sum is σ = 3896357760. Its totient is φ = 251377152.

The previous prime is 1099776707. The next prime is 1099776721. The reversal of 1099776720 is 276779901.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1099776720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099776721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325635 + ... + 328994.

It is an arithmetic number, because the mean of its divisors is an integer number (48704472).

Almost surely, 2^1099776720 is an apocalyptic number.

1099776720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1099776720 is an abundant number, since it is smaller than the sum of its proper divisors (2796581040).

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

1099776720 is a wasteful number, since it uses less digits than its factorization.

1099776720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654652 (or 654646 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 48.

The square root of 1099776720 is about 33162.8816600729. The cubic root of 1099776720 is about 1032.2102660319.

The spelling of 1099776720 in words is "one billion, ninety-nine million, seven hundred seventy-six thousand, seven hundred twenty".