216447328 has 12 divisors (see below), whose sum is σ = 426130740. Its totient is φ = 108223648.

The previous prime is 216447311. The next prime is 216447331. The reversal of 216447328 is 823744612.

216447328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 3381958 + ... + 3382021.

It is an arithmetic number, because the mean of its divisors is an integer number (35510895).

Almost surely, 2^216447328 is an apocalyptic number.

It is an amenable number.

216447328 is a deficient number, since it is larger than the sum of its proper divisors (209683412).

216447328 is an equidigital number, since it uses as much as digits as its factorization.

216447328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6763989 (or 6763981 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The square root of 216447328 is about 14712.1489932640. The cubic root of 216447328 is about 600.4139069953.

The spelling of 216447328 in words is "two hundred sixteen million, four hundred forty-seven thousand, three hundred twenty-eight".