2172406720 has 56 divisors (see below), whose sum is σ = 5643329328. Its totient is φ = 789964800.

The previous prime is 2172406703. The next prime is 2172406721. The reversal of 2172406720 is 276042712.

It is a super-3 number, since 3×2172406720³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172406721) 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 7 ways as a sum of consecutive naturals, for example, 305061 + ... + 312100.

It is an arithmetic number, because the mean of its divisors is an integer number (100773738).

Almost surely, 2^2172406720 is an apocalyptic number.

2172406720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2172406720 is an abundant number, since it is smaller than the sum of its proper divisors (3470922608).

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

2172406720 is a wasteful number, since it uses less digits than its factorization.

2172406720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617189 (or 617179 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 2172406720 is about 46609.0840931250. The cubic root of 2172406720 is about 1295.1310412358.

The spelling of 2172406720 in words is "two billion, one hundred seventy-two million, four hundred six thousand, seven hundred twenty".