2161092720 has 80 divisors (see below), whose sum is σ = 6703856640. Its totient is φ = 575907072.

The previous prime is 2161092709. The next prime is 2161092727. The reversal of 2161092720 is 272901612.

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 (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161092727) 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 15 ways as a sum of consecutive naturals, for example, 691321 + ... + 694439.

It is an arithmetic number, because the mean of its divisors is an integer number (83798208).

Almost surely, 2^2161092720 is an apocalyptic number.

2161092720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161092720 is an abundant number, since it is smaller than the sum of its proper divisors (4542763920).

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

2161092720 is a wasteful number, since it uses less digits than its factorization.

2161092720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6022 (or 6016 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2161092720 is about 46487.5544635336. The cubic root of 2161092720 is about 1292.8787581857.

The spelling of 2161092720 in words is "two billion, one hundred sixty-one million, ninety-two thousand, seven hundred twenty".