216442456 has 8 divisors (see below), whose sum is σ = 405829620. Its totient is φ = 108221224.

The previous prime is 216442427. The next prime is 216442459. The reversal of 216442456 is 654244612.

216442456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216442459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13527646 + ... + 13527661.

Almost surely, 2^216442456 is an apocalyptic number.

It is an amenable number.

216442456 is a deficient number, since it is larger than the sum of its proper divisors (189387164).

216442456 is a wasteful number, since it uses less digits than its factorization.

216442456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27055313 (or 27055309 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 216442456 is about 14711.9834148901. The cubic root of 216442456 is about 600.4094020679.

The spelling of 216442456 in words is "two hundred sixteen million, four hundred forty-two thousand, four hundred fifty-six".