216678888 has 80 divisors (see below), whose sum is σ = 638880000. Its totient is φ = 68421024.

The previous prime is 216678881. The next prime is 216678967. The reversal of 216678888 is 888876612.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (216678881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3513 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (7986000).

Almost surely, 2^216678888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216678888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319440000).

216678888 is an abundant number, since it is smaller than the sum of its proper divisors (422201112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216678888 is a wasteful number, since it uses less digits than its factorization.

216678888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17636 (or 17623 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 216678888 is about 14720.0165760776. The cubic root of 216678888 is about 600.6279425843.

The spelling of 216678888 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eight hundred eighty-eight".