218255648 has 48 divisors (see below), whose sum is σ = 482884416. Its totient is φ = 96349440.

The previous prime is 218255629. The next prime is 218255651. The reversal of 218255648 is 846552812.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1838 + ... + 20973.

It is an arithmetic number, because the mean of its divisors is an integer number (10060092).

Almost surely, 2^218255648 is an apocalyptic number.

It is an amenable number.

218255648 is an abundant number, since it is smaller than the sum of its proper divisors (264628768).

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

218255648 is a wasteful number, since it uses less digits than its factorization.

218255648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22857 (or 22849 counting only the distinct ones).

The product of its digits is 153600, while the sum is 41.

The square root of 218255648 is about 14773.4778572955. The cubic root of 218255648 is about 602.0813346911.

The spelling of 218255648 in words is "two hundred eighteen million, two hundred fifty-five thousand, six hundred forty-eight".