2167172720 has 20 divisors (see below), whose sum is σ = 5038676760. Its totient is φ = 866869056.

The previous prime is 2167172701. The next prime is 2167172729. The reversal of 2167172720 is 272717612.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2167172729) 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 3 ways as a sum of consecutive naturals, for example, 13544750 + ... + 13544909.

It is an arithmetic number, because the mean of its divisors is an integer number (251933838).

Almost surely, 2^2167172720 is an apocalyptic number.

2167172720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2167172720 is an abundant number, since it is smaller than the sum of its proper divisors (2871504040).

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

2167172720 is a wasteful number, since it uses less digits than its factorization.

2167172720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27089672 (or 27089666 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 2167172720 is about 46552.9023799806. The cubic root of 2167172720 is about 1294.0900809782.

The spelling of 2167172720 in words is "two billion, one hundred sixty-seven million, one hundred seventy-two thousand, seven hundred twenty".