216687285888 has 64 divisors (see below), whose sum is σ = 594142590720. Its totient is φ = 69899120640.

The previous prime is 216687285887. The next prime is 216687285937. The reversal of 216687285888 is 888582786612.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (216687285887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9089545 + ... + 9113352.

It is an arithmetic number, because the mean of its divisors is an integer number (9283477980).

Almost surely, 2^216687285888 is an apocalyptic number.

It is an amenable number.

216687285888 is an abundant number, since it is smaller than the sum of its proper divisors (377455304832).

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

216687285888 is a wasteful number, since it uses less digits than its factorization.

216687285888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18202945 (or 18202933 counting only the distinct ones).

The product of its digits is 165150720, while the sum is 69.

The spelling of 216687285888 in words is "two hundred sixteen billion, six hundred eighty-seven million, two hundred eighty-five thousand, eight hundred eighty-eight".