216516984 has 16 divisors (see below), whose sum is σ = 541292520. Its totient is φ = 72172320.

The previous prime is 216516977. The next prime is 216516991. The reversal of 216516984 is 489615612.

It is an interprime number because it is at equal distance from previous prime (216516977) and next prime (216516991).

It is a congruent number.

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, 4510747 + ... + 4510794.

Almost surely, 2^216516984 is an apocalyptic number.

216516984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216516984 is an abundant number, since it is smaller than the sum of its proper divisors (324775536).

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

216516984 is a wasteful number, since it uses less digits than its factorization.

216516984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021550 (or 9021546 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 216516984 is about 14714.5160980577. The cubic root of 216516984 is about 600.4783074908.

The spelling of 216516984 in words is "two hundred sixteen million, five hundred sixteen thousand, nine hundred eighty-four".