2172312636 has 96 divisors (see below), whose sum is σ = 5764469760. Its totient is φ = 631183104.

The previous prime is 2172312619. The next prime is 2172312641. The reversal of 2172312636 is 6362132712.

2172312636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2172312597 and 2172312606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1086790 + ... + 1088786.

It is an arithmetic number, because the mean of its divisors is an integer number (60046560).

Almost surely, 2^2172312636 is an apocalyptic number.

2172312636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2172312636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2882234880).

2172312636 is an abundant number, since it is smaller than the sum of its proper divisors (3592157124).

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

2172312636 is a wasteful number, since it uses less digits than its factorization.

2172312636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403 (or 2401 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 2172312636 is about 46608.0747939668. The cubic root of 2172312636 is about 1295.1123441740.

The spelling of 2172312636 in words is "two billion, one hundred seventy-two million, three hundred twelve thousand, six hundred thirty-six".