216506642 has 16 divisors (see below), whose sum is σ = 354523392. Its totient is φ = 98345520.

The previous prime is 216506639. The next prime is 216506699. The reversal of 216506642 is 246605612.

It is a junction number, because it is equal to n+sod(n) for n = 216506599 and 216506608.

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 7 ways as a sum of consecutive naturals, for example, 46463 + ... + 50909.

It is an arithmetic number, because the mean of its divisors is an integer number (22157712).

Almost surely, 2^216506642 is an apocalyptic number.

216506642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

216506642 is a deficient number, since it is larger than the sum of its proper divisors (138016750).

216506642 is a wasteful number, since it uses less digits than its factorization.

216506642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 216506642 is about 14714.1646721790. The cubic root of 216506642 is about 600.4687466619.

The spelling of 216506642 in words is "two hundred sixteen million, five hundred six thousand, six hundred forty-two".