216449487 has 18 divisors (see below), whose sum is σ = 320113872. Its totient is φ = 140933016.

The previous prime is 216449479. The next prime is 216449489. The reversal of 216449487 is 784944612.

216449487 is a `hidden beast` number, since 2 + 164 + 4 + 9 + 487 = 666.

It is not a de Polignac number, because 216449487 - 2³ = 216449479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216449489) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10138 + ... + 23144.

It is an arithmetic number, because the mean of its divisors is an integer number (17784104).

Almost surely, 2^216449487 is an apocalyptic number.

216449487 is a deficient number, since it is larger than the sum of its proper divisors (103664385).

216449487 is a wasteful number, since it uses less digits than its factorization.

216449487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13099 (or 13053 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 216449487 is about 14712.2223678138. Note that the first 3 decimals coincide. The cubic root of 216449487 is about 600.4159033075.

The spelling of 216449487 in words is "two hundred sixteen million, four hundred forty-nine thousand, four hundred eighty-seven".