216888887 has 4 divisors (see below), whose sum is σ = 216957480. Its totient is φ = 216820296.

The previous prime is 216888871. The next prime is 216888899. The reversal of 216888887 is 788888612.

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 216888887 - 2⁴ = 216888871 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 (216888587) 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, 29312 + ... + 35957.

It is an arithmetic number, because the mean of its divisors is an integer number (54239370).

Almost surely, 2^216888887 is an apocalyptic number.

216888887 is a deficient number, since it is larger than the sum of its proper divisors (68593).

216888887 is an equidigital number, since it uses as much as digits as its factorization.

216888887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68592.

The product of its digits is 2752512, while the sum is 56.

The square root of 216888887 is about 14727.1479587869. The cubic root of 216888887 is about 600.8219170916.

The spelling of 216888887 in words is "two hundred sixteen million, eight hundred eighty-eight thousand, eight hundred eighty-seven".