216454906 has 8 divisors (see below), whose sum is σ = 325097280. Its totient is φ = 108089148.

The previous prime is 216454883. The next prime is 216454937. The reversal of 216454906 is 609454612.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67186 + ... + 70333.

It is an arithmetic number, because the mean of its divisors is an integer number (40637160).

Almost surely, 2^216454906 is an apocalyptic number.

216454906 is a deficient number, since it is larger than the sum of its proper divisors (108642374).

216454906 is a wasteful number, since it uses less digits than its factorization.

216454906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138308.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 216454906 is about 14712.4065332630. The cubic root of 216454906 is about 600.4209139093.

The spelling of 216454906 in words is "two hundred sixteen million, four hundred fifty-four thousand, nine hundred six".