2172645372 has 12 divisors (see below), whose sum is σ = 5069505896. Its totient is φ = 724215120.

The previous prime is 2172645337. The next prime is 2172645401. The reversal of 2172645372 is 2735462712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2172645372.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90526879 + ... + 90526902.

Almost surely, 2^2172645372 is an apocalyptic number.

It is an amenable number.

2172645372 is an abundant number, since it is smaller than the sum of its proper divisors (2896860524).

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

2172645372 is a wasteful number, since it uses less digits than its factorization.

2172645372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181053788 (or 181053786 counting only the distinct ones).

The product of its digits is 141120, while the sum is 39.

The square root of 2172645372 is about 46611.6441675254. The cubic root of 2172645372 is about 1295.1784654885.

The spelling of 2172645372 in words is "two billion, one hundred seventy-two million, six hundred forty-five thousand, three hundred seventy-two".