216444644 has 24 divisors (see below), whose sum is σ = 409868928. Its totient is φ = 99419040.

The previous prime is 216444643. The next prime is 216444647. The reversal of 216444644 is 446444612.

It is not an unprimeable number, because it can be changed into a prime (216444643) 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, 1109 + ... + 20835.

It is an arithmetic number, because the mean of its divisors is an integer number (17077872).

Almost surely, 2^216444644 is an apocalyptic number.

It is an amenable number.

216444644 is a deficient number, since it is larger than the sum of its proper divisors (193424284).

216444644 is a wasteful number, since it uses less digits than its factorization.

216444644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19955 (or 19953 counting only the distinct ones).

The product of its digits is 73728, while the sum is 35.

The square root of 216444644 is about 14712.0577758518. The cubic root of 216444644 is about 600.4114252251.

The spelling of 216444644 in words is "two hundred sixteen million, four hundred forty-four thousand, six hundred forty-four".