216504004 has 24 divisors (see below), whose sum is σ = 383846400. Its totient is φ = 106840800.

The previous prime is 216503971. The next prime is 216504019. The reversal of 216504004 is 400405612.

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, 168637 + ... + 169915.

It is an arithmetic number, because the mean of its divisors is an integer number (15993600).

Almost surely, 2^216504004 is an apocalyptic number.

It is an amenable number.

216504004 is a deficient number, since it is larger than the sum of its proper divisors (167342396).

216504004 is a wasteful number, since it uses less digits than its factorization.

216504004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1801 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 216504004 is about 14714.0750303918. The cubic root of 216504004 is about 600.4663078714.

Adding to 216504004 its reverse (400405612), we get a palindrome (616909616).

The spelling of 216504004 in words is "two hundred sixteen million, five hundred four thousand, four".