216681744 has 40 divisors (see below), whose sum is σ = 560638720. Its totient is φ = 72114048.

The previous prime is 216681743. The next prime is 216681767. The reversal of 216681744 is 447186612.

It is not an unprimeable number, because it can be changed into a prime (216681743) 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, 30849 + ... + 37215.

It is an arithmetic number, because the mean of its divisors is an integer number (14015968).

Almost surely, 2^216681744 is an apocalyptic number.

216681744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216681744 is an abundant number, since it is smaller than the sum of its proper divisors (343956976).

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

216681744 is a wasteful number, since it uses less digits than its factorization.

216681744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7087 (or 7081 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 216681744 is about 14720.1135865183. The cubic root of 216681744 is about 600.6305814906.

The spelling of 216681744 in words is "two hundred sixteen million, six hundred eighty-one thousand, seven hundred forty-four".