216621630 has 48 divisors (see below), whose sum is σ = 564071040. Its totient is φ = 57678144.

The previous prime is 216621623. The next prime is 216621689. The reversal of 216621630 is 36126612.

216621630 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 21 + 630 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 216621594 and 216621603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76276 + ... + 79064.

It is an arithmetic number, because the mean of its divisors is an integer number (11751480).

Almost surely, 2^216621630 is an apocalyptic number.

216621630 is an abundant number, since it is smaller than the sum of its proper divisors (347449410).

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

216621630 is a wasteful number, since it uses less digits than its factorization.

216621630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665 (or 3662 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 216621630 is about 14718.0715448730. The cubic root of 216621630 is about 600.5750320542.

The spelling of 216621630 in words is "two hundred sixteen million, six hundred twenty-one thousand, six hundred thirty".