216623172 has 48 divisors (see below), whose sum is σ = 521889984. Its totient is φ = 69888000.

The previous prime is 216623171. The next prime is 216623189. The reversal of 216623172 is 271326612.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (216623171) 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, 62772 + ... + 66132.

It is an arithmetic number, because the mean of its divisors is an integer number (10872708).

Almost surely, 2^216623172 is an apocalyptic number.

It is an amenable number.

216623172 is an abundant number, since it is smaller than the sum of its proper divisors (305266812).

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

216623172 is a wasteful number, since it uses less digits than its factorization.

216623172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540 (or 3538 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 216623172 is about 14718.1239293600. The cubic root of 216623172 is about 600.5764570958.

Adding to 216623172 its reverse (271326612), we get a palindrome (487949784).

The spelling of 216623172 in words is "two hundred sixteen million, six hundred twenty-three thousand, one hundred seventy-two".