216340286 has 8 divisors (see below), whose sum is σ = 325430784. Its totient is φ = 107863360.

The previous prime is 216340219. The next prime is 216340301. The reversal of 216340286 is 682043612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152510 + ... + 153921.

It is an arithmetic number, because the mean of its divisors is an integer number (40678848).

Almost surely, 2^216340286 is an apocalyptic number.

216340286 is a deficient number, since it is larger than the sum of its proper divisors (109090498).

216340286 is a wasteful number, since it uses less digits than its factorization.

216340286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306786.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 216340286 is about 14708.5106655977. The cubic root of 216340286 is about 600.3149143157.

Adding to 216340286 its reverse (682043612), we get a palindrome (898383898).

The spelling of 216340286 in words is "two hundred sixteen million, three hundred forty thousand, two hundred eighty-six".