216507830 has 64 divisors (see below), whose sum is σ = 487959552. Its totient is φ = 67194240.

The previous prime is 216507829. The next prime is 216507857. The reversal of 216507830 is 38705612.

It is a happy number.

216507830 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243647 + ... + 244533.

It is an arithmetic number, because the mean of its divisors is an integer number (7624368).

Almost surely, 2^216507830 is an apocalyptic number.

216507830 is an abundant number, since it is smaller than the sum of its proper divisors (271451722).

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

216507830 is a wasteful number, since it uses less digits than its factorization.

216507830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 216507830 is about 14714.2050413877. The cubic root of 216507830 is about 600.4698449431.

The spelling of 216507830 in words is "two hundred sixteen million, five hundred seven thousand, eight hundred thirty".