216516732 has 12 divisors (see below), whose sum is σ = 505205736. Its totient is φ = 72172240.

The previous prime is 216516691. The next prime is 216516757. The reversal of 216516732 is 237615612.

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

It is a junction number, because it is equal to n+sod(n) for n = 216516693 and 216516702.

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, 9021519 + ... + 9021542.

It is an arithmetic number, because the mean of its divisors is an integer number (42100478).

Almost surely, 2^216516732 is an apocalyptic number.

It is an amenable number.

216516732 is an abundant number, since it is smaller than the sum of its proper divisors (288689004).

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

216516732 is a wasteful number, since it uses less digits than its factorization.

216516732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18043068 (or 18043066 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 216516732 is about 14714.5075350825. The cubic root of 216516732 is about 600.4780745290.

The spelling of 216516732 in words is "two hundred sixteen million, five hundred sixteen thousand, seven hundred thirty-two".