216495786 has 32 divisors (see below), whose sum is σ = 467869248. Its totient is φ = 66389760.

The previous prime is 216495749. The next prime is 216495809. The reversal of 216495786 is 687594612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19426 + ... + 28466.

It is an arithmetic number, because the mean of its divisors is an integer number (14620914).

Almost surely, 2^216495786 is an apocalyptic number.

216495786 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216495786 is an abundant number, since it is smaller than the sum of its proper divisors (251373462).

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

216495786 is a wasteful number, since it uses less digits than its factorization.

216495786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9366.

The product of its digits is 725760, while the sum is 48.

The square root of 216495786 is about 14713.7957713161. The cubic root of 216495786 is about 600.4587103298.

The spelling of 216495786 in words is "two hundred sixteen million, four hundred ninety-five thousand, seven hundred eighty-six".