216287087 has 4 divisors (see below), whose sum is σ = 219333456. Its totient is φ = 213240720.

The previous prime is 216287077. The next prime is 216287111. The reversal of 216287087 is 780782612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216287087 - 2⁶ = 216287023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216287047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523078 + ... + 1523219.

It is an arithmetic number, because the mean of its divisors is an integer number (54833364).

Almost surely, 2^216287087 is an apocalyptic number.

216287087 is a deficient number, since it is larger than the sum of its proper divisors (3046369).

216287087 is an equidigital number, since it uses as much as digits as its factorization.

216287087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046368.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 216287087 is about 14706.7021116224. The cubic root of 216287087 is about 600.2657036149.

The spelling of 216287087 in words is "two hundred sixteen million, two hundred eighty-seven thousand, eighty-seven".