216687708 has 18 divisors (see below), whose sum is σ = 547738464. Its totient is φ = 72229224.

The previous prime is 216687703. The next prime is 216687743. The reversal of 216687708 is 807786612.

216687708 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216687701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3009516 + ... + 3009587.

Almost surely, 2^216687708 is an apocalyptic number.

It is an amenable number.

216687708 is an abundant number, since it is smaller than the sum of its proper divisors (331050756).

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

216687708 is a wasteful number, since it uses less digits than its factorization.

216687708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6019113 (or 6019108 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 216687708 is about 14720.3161650829. The cubic root of 216687708 is about 600.6360920732.

The spelling of 216687708 in words is "two hundred sixteen million, six hundred eighty-seven thousand, seven hundred eight".