216623136 has 48 divisors (see below), whose sum is σ = 569588544. Its totient is φ = 72086784.

The previous prime is 216623117. The next prime is 216623159. The reversal of 216623136 is 631326612.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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, 69810 + ... + 72846.

It is an arithmetic number, because the mean of its divisors is an integer number (11866428).

Almost surely, 2^216623136 is an apocalyptic number.

It is an amenable number.

216623136 is an abundant number, since it is smaller than the sum of its proper divisors (352965408).

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

216623136 is a wasteful number, since it uses less digits than its factorization.

216623136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793 (or 3785 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 216623136 is about 14718.1227063780. The cubic root of 216623136 is about 600.5764238264.

Adding to 216623136 its reverse (631326612), we get a palindrome (847949748).

The spelling of 216623136 in words is "two hundred sixteen million, six hundred twenty-three thousand, one hundred thirty-six".