216902887 has 4 divisors (see below), whose sum is σ = 217205280. Its totient is φ = 216600496.

The previous prime is 216902863. The next prime is 216902891. The reversal of 216902887 is 788209612.

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 216902887 - 2²³ = 208514279 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 (216903887) 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, 150118 + ... + 151555.

It is an arithmetic number, because the mean of its divisors is an integer number (54301320).

Almost surely, 2^216902887 is an apocalyptic number.

216902887 is a deficient number, since it is larger than the sum of its proper divisors (302393).

216902887 is an equidigital number, since it uses as much as digits as its factorization.

216902887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302392.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 216902887 is about 14727.6232637856. The cubic root of 216902887 is about 600.8348443343.

The spelling of 216902887 in words is "two hundred sixteen million, nine hundred two thousand, eight hundred eighty-seven".