216642858 has 32 divisors (see below), whose sum is σ = 444787200. Its totient is φ = 70308336.

The previous prime is 216642817. The next prime is 216642863. The reversal of 216642858 is 858246612.

216642858 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91453 + ... + 93791.

It is an arithmetic number, because the mean of its divisors is an integer number (13899600).

Almost surely, 2^216642858 is an apocalyptic number.

216642858 is an abundant number, since it is smaller than the sum of its proper divisors (228144342).

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

216642858 is a wasteful number, since it uses less digits than its factorization.

216642858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746.

The product of its digits is 184320, while the sum is 42.

The square root of 216642858 is about 14718.7926814668. The cubic root of 216642858 is about 600.5946493478.

The spelling of 216642858 in words is "two hundred sixteen million, six hundred forty-two thousand, eight hundred fifty-eight".