2172188964 has 48 divisors (see below), whose sum is σ = 5559817536. Its totient is φ = 654595200.

The previous prime is 2172188911. The next prime is 2172188969. The reversal of 2172188964 is 4698812712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2172188969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21567 + ... + 69350.

It is an arithmetic number, because the mean of its divisors is an integer number (115829532).

Almost surely, 2^2172188964 is an apocalyptic number.

It is an amenable number.

2172188964 is an abundant number, since it is smaller than the sum of its proper divisors (3387628572).

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

2172188964 is a wasteful number, since it uses less digits than its factorization.

2172188964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91116 (or 91114 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 2172188964 is about 46606.7480521866. The cubic root of 2172188964 is about 1295.0877663468.

It can be divided in two parts, 21721 and 88964, that added together give a triangular number (110685 = T₄₇₀).

The spelling of 2172188964 in words is "two billion, one hundred seventy-two million, one hundred eighty-eight thousand, nine hundred sixty-four".