216341988 has 12 divisors (see below), whose sum is σ = 504798000. Its totient is φ = 72113992.

The previous prime is 216341977. The next prime is 216342011. The reversal of 216341988 is 889143612.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9014238 + ... + 9014261.

It is an arithmetic number, because the mean of its divisors is an integer number (42066500).

Almost surely, 2^216341988 is an apocalyptic number.

It is an amenable number.

216341988 is an abundant number, since it is smaller than the sum of its proper divisors (288456012).

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

216341988 is a wasteful number, since it uses less digits than its factorization.

216341988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18028506 (or 18028504 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 216341988 is about 14708.5685231432. The cubic root of 216341988 is about 600.3164885845.

The spelling of 216341988 in words is "two hundred sixteen million, three hundred forty-one thousand, nine hundred eighty-eight".