218401056 has 48 divisors (see below), whose sum is σ = 637005600. Its totient is φ = 72800064.

The previous prime is 218401049. The next prime is 218401081. The reversal of 218401056 is 650104812.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 125526 + ... + 127253.

It is an arithmetic number, because the mean of its divisors is an integer number (13270950).

Almost surely, 2^218401056 is an apocalyptic number.

It is an amenable number.

218401056 is an abundant number, since it is smaller than the sum of its proper divisors (418604544).

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

218401056 is a wasteful number, since it uses less digits than its factorization.

218401056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252798 (or 252784 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 218401056 is about 14778.3982893952. The cubic root of 218401056 is about 602.2150128013.

Adding to 218401056 its reverse (650104812), we get a palindrome (868505868).

The spelling of 218401056 in words is "two hundred eighteen million, four hundred one thousand, fifty-six".