216345642 has 32 divisors (see below), whose sum is σ = 448132608. Its totient is φ = 69582576.

The previous prime is 216345637. The next prime is 216345667. The reversal of 216345642 is 246543612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16363 + ... + 26465.

It is an arithmetic number, because the mean of its divisors is an integer number (14004144).

Almost surely, 2^216345642 is an apocalyptic number.

216345642 is an abundant number, since it is smaller than the sum of its proper divisors (231786966).

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

216345642 is a wasteful number, since it uses less digits than its factorization.

216345642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10234.

The product of its digits is 34560, while the sum is 33.

The square root of 216345642 is about 14708.6927359300. The cubic root of 216345642 is about 600.3198683323.

The spelling of 216345642 in words is "two hundred sixteen million, three hundred forty-five thousand, six hundred forty-two".