168216636 has 24 divisors (see below), whose sum is σ = 448577920. Its totient is φ = 48061872.

The previous prime is 168216623. The next prime is 168216637. The reversal of 168216636 is 636612861.

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

It is a junction number, because it is equal to n+sod(n) for n = 168216594 and 168216603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168216637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001206 + ... + 1001373.

Almost surely, 2^168216636 is an apocalyptic number.

It is an amenable number.

168216636 is an abundant number, since it is smaller than the sum of its proper divisors (280361284).

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

168216636 is a wasteful number, since it uses less digits than its factorization.

168216636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002593 (or 2002591 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 168216636 is about 12969.8356196214. The cubic root of 168216636 is about 552.0219089183.

The spelling of 168216636 in words is "one hundred sixty-eight million, two hundred sixteen thousand, six hundred thirty-six".