216662406 has 8 divisors (see below), whose sum is σ = 433324824. Its totient is φ = 72220800.

The previous prime is 216662387. The next prime is 216662429. The reversal of 216662406 is 604266612.

It is a sphenic number, since it is the product of 3 distinct primes.

216662406 is an admirable number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 18055195 + ... + 18055206.

It is an arithmetic number, because the mean of its divisors is an integer number (54165603).

Almost surely, 2^216662406 is an apocalyptic number.

216662406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216662406 is a wasteful number, since it uses less digits than its factorization.

216662406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36110406.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 216662406 is about 14719.4567155177. The cubic root of 216662406 is about 600.6127129806.

The spelling of 216662406 in words is "two hundred sixteen million, six hundred sixty-two thousand, four hundred six".