216405168 has 60 divisors (see below), whose sum is σ = 650326680. Its totient is φ = 61829376.

The previous prime is 216405139. The next prime is 216405199. The reversal of 216405168 is 861504612.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43653 + ... + 48356.

It is an arithmetic number, because the mean of its divisors is an integer number (10838778).

Almost surely, 2^216405168 is an apocalyptic number.

216405168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216405168 is an abundant number, since it is smaller than the sum of its proper divisors (433921512).

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

216405168 is a wasteful number, since it uses less digits than its factorization.

216405168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92034 (or 92021 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 216405168 is about 14710.7160940588. The cubic root of 216405168 is about 600.3749212302.

The spelling of 216405168 in words is "two hundred sixteen million, four hundred five thousand, one hundred sixty-eight".