216987630 has 32 divisors (see below), whose sum is σ = 521866368. Its totient is φ = 57741600.

The previous prime is 216987613. The next prime is 216987679. The reversal of 216987630 is 36789612.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent 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, 7365 + ... + 22095.

It is an arithmetic number, because the mean of its divisors is an integer number (16308324).

Almost surely, 2^216987630 is an apocalyptic number.

It is a pronic number, being equal to 14730×14731.

216987630 is an abundant number, since it is smaller than the sum of its proper divisors (304878738).

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

216987630 is a wasteful number, since it uses less digits than its factorization.

216987630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15232.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 216987630 is about 14730.4999915142. The cubic root of 216987630 is about 600.9130819862.

The spelling of 216987630 in words is "two hundred sixteen million, nine hundred eighty-seven thousand, six hundred thirty".