18070216 has 24 divisors (see below), whose sum is σ = 35764470. Its totient is φ = 8558208.

The previous prime is 18070187. The next prime is 18070253. The reversal of 18070216 is 61207081.

It can be written as a sum of positive squares in only one way, i.e., 9947716 + 8122500 = 3154^2 + 2850^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 241 + ... + 6016.

Almost surely, 2^18070216 is an apocalyptic number.

It is an amenable number.

18070216 is a deficient number, since it is larger than the sum of its proper divisors (17694254).

18070216 is a wasteful number, since it uses less digits than its factorization.

18070216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6301 (or 6278 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 18070216 is about 4250.9076677811. The cubic root of 18070216 is about 262.4144713043.

Adding to 18070216 its reverse (61207081), we get a palindrome (79277297).

The spelling of 18070216 in words is "eighteen million, seventy thousand, two hundred sixteen".