216420304 has 40 divisors (see below), whose sum is σ = 433847232. Its totient is φ = 104513280.

The previous prime is 216420257. The next prime is 216420307. The reversal of 216420304 is 403024612.

It is a happy number.

216420304 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216420307) 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, 65967 + ... + 69169.

Almost surely, 2^216420304 is an apocalyptic number.

It is an amenable number.

216420304 is an abundant number, since it is smaller than the sum of its proper divisors (217426928).

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

216420304 is a wasteful number, since it uses less digits than its factorization.

216420304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3355 (or 3349 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 216420304 is about 14711.2305399650. The cubic root of 216420304 is about 600.3889182203.

Adding to 216420304 its reverse (403024612), we get a palindrome (619444916).

The spelling of 216420304 in words is "two hundred sixteen million, four hundred twenty thousand, three hundred four".