216628830 has 160 divisors (see below), whose sum is σ = 652040928. Its totient is φ = 51148800.

The previous prime is 216628829. The next prime is 216628849. The reversal of 216628830 is 38826612.

216628830 is a `hidden beast` number, since 21 + 6 + 628 + 8 + 3 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 365014 + ... + 365606.

Almost surely, 2^216628830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216628830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326020464).

216628830 is an abundant number, since it is smaller than the sum of its proper divisors (435412098).

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

216628830 is a wasteful number, since it uses less digits than its factorization.

216628830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 216628830 is about 14718.3161401024. The cubic root of 216628830 is about 600.5816858870.

The spelling of 216628830 in words is "two hundred sixteen million, six hundred twenty-eight thousand, eight hundred thirty".