216243290 has 32 divisors (see below), whose sum is σ = 404296704. Its totient is φ = 83185920.

The previous prime is 216243271. The next prime is 216243331. The reversal of 216243290 is 92342612.

It is a super-2 number, since 2×216243290² = 93522320940048200, which contains 22 as substring.

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, 49682 + ... + 53858.

It is an arithmetic number, because the mean of its divisors is an integer number (12634272).

Almost surely, 2^216243290 is an apocalyptic number.

216243290 is a deficient number, since it is larger than the sum of its proper divisors (188053414).

216243290 is a wasteful number, since it uses less digits than its factorization.

216243290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 216243290 is about 14705.2130212384. The cubic root of 216243290 is about 600.2251839949.

The spelling of 216243290 in words is "two hundred sixteen million, two hundred forty-three thousand, two hundred ninety".