216871900288 has 32 divisors (see below), whose sum is σ = 450834255360. Its totient is φ = 103721342208.

The previous prime is 216871900261. The next prime is 216871900313. The reversal of 216871900288 is 882009178612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×216871900288² (a number of 23 digits) contains 22 as substring.

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, 36829920 + ... + 36835807.

It is an arithmetic number, because the mean of its divisors is an integer number (14088570480).

Almost surely, 2^216871900288 is an apocalyptic number.

It is an amenable number.

216871900288 is an abundant number, since it is smaller than the sum of its proper divisors (233962355072).

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

216871900288 is an equidigital number, since it uses as much as digits as its factorization.

216871900288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73665764 (or 73665752 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 216871900288 in words is "two hundred sixteen billion, eight hundred seventy-one million, nine hundred thousand, two hundred eighty-eight".