216432643 has 8 divisors (see below), whose sum is σ = 247531520. Its totient is φ = 185378760.

The previous prime is 216432641. The next prime is 216432677. The reversal of 216432643 is 346234612.

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

It is not a de Polignac number, because 216432643 - 2¹ = 216432641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216432641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213 + ... + 20806.

It is an arithmetic number, because the mean of its divisors is an integer number (30941440).

Almost surely, 2^216432643 is an apocalyptic number.

216432643 is a deficient number, since it is larger than the sum of its proper divisors (31098877).

216432643 is a wasteful number, since it uses less digits than its factorization.

216432643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22497.

The product of its digits is 20736, while the sum is 31.

The square root of 216432643 is about 14711.6499074713. The cubic root of 216432643 is about 600.4003282065.

The spelling of 216432643 in words is "two hundred sixteen million, four hundred thirty-two thousand, six hundred forty-three".