216445648 has 10 divisors (see below), whose sum is σ = 419363474. Its totient is φ = 108222816.

The previous prime is 216445631. The next prime is 216445661. The reversal of 216445648 is 846544612.

216445648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 216442944 + 2704 = 14712^2 + 52^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216445648.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6763911 + ... + 6763942.

Almost surely, 2^216445648 is an apocalyptic number.

It is an amenable number.

216445648 is a deficient number, since it is larger than the sum of its proper divisors (202917826).

216445648 is a wasteful number, since it uses less digits than its factorization.

216445648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13527861 (or 13527855 counting only the distinct ones).

The product of its digits is 184320, while the sum is 40.

The square root of 216445648 is about 14712.0918974835. The cubic root of 216445648 is about 600.4123535797.

The spelling of 216445648 in words is "two hundred sixteen million, four hundred forty-five thousand, six hundred forty-eight".