216428809308 has 12 divisors (see below), whose sum is σ = 505000555080. Its totient is φ = 72142936432.

The previous prime is 216428809307. The next prime is 216428809349. The reversal of 216428809308 is 803908824612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216428809307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9017867043 + ... + 9017867066.

It is an arithmetic number, because the mean of its divisors is an integer number (42083379590).

Almost surely, 2^216428809308 is an apocalyptic number.

It is an amenable number.

216428809308 is an abundant number, since it is smaller than the sum of its proper divisors (288571745772).

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

216428809308 is a wasteful number, since it uses less digits than its factorization.

216428809308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18035734116 (or 18035734114 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The spelling of 216428809308 in words is "two hundred sixteen billion, four hundred twenty-eight million, eight hundred nine thousand, three hundred eight".