216654320 has 40 divisors (see below), whose sum is σ = 508631136. Its totient is φ = 85817088.

The previous prime is 216654311. The next prime is 216654343. The reversal of 216654320 is 23456612.

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, 4907 + ... + 21386.

Almost surely, 2^216654320 is an apocalyptic number.

216654320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216654320 is an abundant number, since it is smaller than the sum of its proper divisors (291976816).

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

216654320 is a wasteful number, since it uses less digits than its factorization.

216654320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26409 (or 26403 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 216654320 is about 14719.1820424914. The cubic root of 216654320 is about 600.6052411185.

The spelling of 216654320 in words is "two hundred sixteen million, six hundred fifty-four thousand, three hundred twenty".