216443040 has 96 divisors (see below), whose sum is σ = 743795136. Its totient is φ = 52469760.

The previous prime is 216443039. The next prime is 216443053. The reversal of 216443040 is 40344612.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 216443040.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15217 + ... + 25776.

It is an arithmetic number, because the mean of its divisors is an integer number (7747866).

Almost surely, 2^216443040 is an apocalyptic number.

216443040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216443040 is an abundant number, since it is smaller than the sum of its proper divisors (527352096).

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

216443040 is a wasteful number, since it uses less digits than its factorization.

216443040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41022 (or 41014 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 216443040 is about 14712.0032626424. The cubic root of 216443040 is about 600.4099420709.

Adding to 216443040 its reverse (40344612), we get a palindrome (256787652).

The spelling of 216443040 in words is "two hundred sixteen million, four hundred forty-three thousand, forty".