2120731664 has 80 divisors (see below), whose sum is σ = 4472630400. Its totient is φ = 970693632.

The previous prime is 2120731651. The next prime is 2120731699. The reversal of 2120731664 is 4661370212.

It is a self number, because there is not a number n which added to its sum of digits gives 2120731664.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1877852 + ... + 1878980.

It is an arithmetic number, because the mean of its divisors is an integer number (55907880).

Almost surely, 2^2120731664 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 2120731664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236315200).

2120731664 is an abundant number, since it is smaller than the sum of its proper divisors (2351898736).

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

2120731664 is a wasteful number, since it uses less digits than its factorization.

2120731664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 2120731664 is about 46051.4024107844. The cubic root of 2120731664 is about 1284.7794266792.

The spelling of 2120731664 in words is "two billion, one hundred twenty million, seven hundred thirty-one thousand, six hundred sixty-four".