216645344 has 24 divisors (see below), whose sum is σ = 434571480. Its totient is φ = 106278016.

The previous prime is 216645307. The next prime is 216645409. The reversal of 216645344 is 443546612.

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, 62174 + ... + 65565.

It is an arithmetic number, because the mean of its divisors is an integer number (18107145).

Almost surely, 2^216645344 is an apocalyptic number.

It is an amenable number.

216645344 is an abundant number, since it is smaller than the sum of its proper divisors (217926136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216645344 is a wasteful number, since it uses less digits than its factorization.

216645344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127802 (or 127794 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 216645344 is about 14718.8771310858. The cubic root of 216645344 is about 600.5969466350.

The spelling of 216645344 in words is "two hundred sixteen million, six hundred forty-five thousand, three hundred forty-four".