216631432 has 16 divisors (see below), whose sum is σ = 406773900. Its totient is φ = 108158400.

The previous prime is 216631397. The next prime is 216631433. The reversal of 216631432 is 234136612.

It can be written as a sum of positive squares in 2 ways, for example, as 214153956 + 2477476 = 14634^2 + 1574^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216631432.

It is not an unprimeable number, because it can be changed into a prime (216631433) 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 3 ways as a sum of consecutive naturals, for example, 13707 + ... + 24922.

Almost surely, 2^216631432 is an apocalyptic number.

It is an amenable number.

216631432 is a deficient number, since it is larger than the sum of its proper divisors (190142468).

216631432 is a wasteful number, since it uses less digits than its factorization.

216631432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39336 (or 39332 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 216631432 is about 14718.4045331007. The cubic root of 216631432 is about 600.5840904720.

The spelling of 216631432 in words is "two hundred sixteen million, six hundred thirty-one thousand, four hundred thirty-two".