216632730 has 32 divisors (see below), whose sum is σ = 529732224. Its totient is φ = 56678336.

The previous prime is 216632711. The next prime is 216632747. The reversal of 216632730 is 37236612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66534 + ... + 69713.

It is an arithmetic number, because the mean of its divisors is an integer number (16554132).

Almost surely, 2^216632730 is an apocalyptic number.

216632730 is an abundant number, since it is smaller than the sum of its proper divisors (313099494).

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

216632730 is a wasteful number, since it uses less digits than its factorization.

216632730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136310.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 216632730 is about 14718.4486274879. The cubic root of 216632730 is about 600.5852899849.

The spelling of 216632730 in words is "two hundred sixteen million, six hundred thirty-two thousand, seven hundred thirty".