216446320 has 40 divisors (see below), whose sum is σ = 503945424. Its totient is φ = 86456832.

The previous prime is 216446317. The next prime is 216446389. The reversal of 216446320 is 23644612.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74332 + ... + 77188.

Almost surely, 2^216446320 is an apocalyptic number.

216446320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216446320 is an abundant number, since it is smaller than the sum of its proper divisors (287499104).

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

216446320 is a wasteful number, since it uses less digits than its factorization.

216446320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3817 (or 3811 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 216446320 is about 14712.1147358223. The cubic root of 216446320 is about 600.4129749469.

It can be divided in two parts, 2164 and 46320, that added together give a palindrome (48484).

The spelling of 216446320 in words is "two hundred sixteen million, four hundred forty-six thousand, three hundred twenty".