213632172 has 72 divisors (see below), whose sum is σ = 583971024. Its totient is φ = 65460096.

The previous prime is 213632171. The next prime is 213632189. The reversal of 213632172 is 271236312.

213632172 is a `hidden beast` number, since 2 + 13 + 632 + 17 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (213632171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131638 + ... + 133250.

Almost surely, 2^213632172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213632172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291985512).

213632172 is an abundant number, since it is smaller than the sum of its proper divisors (370338852).

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

213632172 is a wasteful number, since it uses less digits than its factorization.

213632172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919 (or 1914 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 213632172 is about 14616.1613291589. The cubic root of 213632172 is about 597.7995062446.

Adding to 213632172 its reverse (271236312), we get a palindrome (484868484).

The spelling of 213632172 in words is "two hundred thirteen million, six hundred thirty-two thousand, one hundred seventy-two".