216512304 has 40 divisors (see below), whose sum is σ = 559851072. Its totient is φ = 72102720.

The previous prime is 216512281. The next prime is 216512321. The reversal of 216512304 is 403215612.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 95407 + ... + 97649.

Almost surely, 2^216512304 is an apocalyptic number.

216512304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216512304 is an abundant number, since it is smaller than the sum of its proper divisors (343338768).

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

216512304 is a wasteful number, since it uses less digits than its factorization.

216512304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4265 (or 4259 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 216512304 is about 14714.3570705621. The cubic root of 216512304 is about 600.4739810269.

Adding to 216512304 its reverse (403215612), we get a palindrome (619727916).

The spelling of 216512304 in words is "two hundred sixteen million, five hundred twelve thousand, three hundred four".