218922648 has 128 divisors (see below), whose sum is σ = 665625600. Its totient is φ = 58646016.

The previous prime is 218922619. The next prime is 218922707. The reversal of 218922648 is 846229812.

218922648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204258 + ... + 205326.

It is an arithmetic number, because the mean of its divisors is an integer number (5200200).

Almost surely, 2^218922648 is an apocalyptic number.

218922648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218922648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332812800).

218922648 is an abundant number, since it is smaller than the sum of its proper divisors (446702952).

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

218922648 is a wasteful number, since it uses less digits than its factorization.

218922648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1157 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 218922648 is about 14796.0348742492. The cubic root of 218922648 is about 602.6940410226.

The spelling of 218922648 in words is "two hundred eighteen million, nine hundred twenty-two thousand, six hundred forty-eight".