2117649756 has 12 divisors (see below), whose sum is σ = 4941182792. Its totient is φ = 705883248.

The previous prime is 2117649707. The next prime is 2117649757. The reversal of 2117649756 is 6579467112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117649757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88235395 + ... + 88235418.

Almost surely, 2^2117649756 is an apocalyptic number.

It is an amenable number.

2117649756 is an abundant number, since it is smaller than the sum of its proper divisors (2823533036).

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

2117649756 is a wasteful number, since it uses less digits than its factorization.

2117649756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176470820 (or 176470818 counting only the distinct ones).

The product of its digits is 635040, while the sum is 48.

The square root of 2117649756 is about 46017.9286365651. The cubic root of 2117649756 is about 1284.1567655374.

The spelling of 2117649756 in words is "two billion, one hundred seventeen million, six hundred forty-nine thousand, seven hundred fifty-six".