216204836 has 6 divisors (see below), whose sum is σ = 378358470. Its totient is φ = 108102416.

The previous prime is 216204829. The next prime is 216204839. The reversal of 216204836 is 638402612.

It can be written as a sum of positive squares in only one way, i.e., 125574436 + 90630400 = 11206^2 + 9520^2 .

It is a super-2 number, since 2×216204836² = 93489062219573792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216204839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27025601 + ... + 27025608.

It is an arithmetic number, because the mean of its divisors is an integer number (63059745).

Almost surely, 2^216204836 is an apocalyptic number.

It is an amenable number.

216204836 is a deficient number, since it is larger than the sum of its proper divisors (162153634).

216204836 is a wasteful number, since it uses less digits than its factorization.

216204836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54051213 (or 54051211 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 216204836 is about 14703.9054675960. The cubic root of 216204836 is about 600.1896030411.

The spelling of 216204836 in words is "two hundred sixteen million, two hundred four thousand, eight hundred thirty-six".