216671894 has 4 divisors (see below), whose sum is σ = 325007844. Its totient is φ = 108335946.

The previous prime is 216671879. The next prime is 216671899. The reversal of 216671894 is 498176612.

216671894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216671899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54167972 + ... + 54167975.

It is an arithmetic number, because the mean of its divisors is an integer number (81251961).

Almost surely, 2^216671894 is an apocalyptic number.

216671894 is a deficient number, since it is larger than the sum of its proper divisors (108335950).

216671894 is a wasteful number, since it uses less digits than its factorization.

216671894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108335949.

The product of its digits is 145152, while the sum is 44.

The square root of 216671894 is about 14719.7790064933. The cubic root of 216671894 is about 600.6214801226.

The spelling of 216671894 in words is "two hundred sixteen million, six hundred seventy-one thousand, eight hundred ninety-four".