216203904 has 224 divisors, whose sum is σ = 740267040. Its totient is φ = 61585920.

The previous prime is 216203899. The next prime is 216203927. The reversal of 216203904 is 409302612.

216203904 is a `hidden beast` number, since 2 + 1 + 620 + 39 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 653019 + ... + 653349.

Almost surely, 2^216203904 is an apocalyptic number.

216203904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216203904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370133520).

216203904 is an abundant number, since it is smaller than the sum of its proper divisors (524063136).

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

216203904 is an frugal number, since it uses more digits than its factorization.

216203904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 216203904 is about 14703.8737753015. The cubic root of 216203904 is about 600.1887406221.

The spelling of 216203904 in words is "two hundred sixteen million, two hundred three thousand, nine hundred four".