218285604 has 120 divisors (see below), whose sum is σ = 611872800. Its totient is φ = 67651200.

The previous prime is 218285597. The next prime is 218285609. The reversal of 218285604 is 406582812.

218285604 is a `hidden beast` number, since 21 + 8 + 28 + 5 + 604 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (218285609) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 362904 + ... + 363504.

It is an arithmetic number, because the mean of its divisors is an integer number (5098940).

Almost surely, 2^218285604 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 218285604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305936400).

218285604 is an abundant number, since it is smaller than the sum of its proper divisors (393587196).

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

218285604 is a wasteful number, since it uses less digits than its factorization.

218285604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 218285604 is about 14774.4916663823. The cubic root of 218285604 is about 602.1088790312.

The spelling of 218285604 in words is "two hundred eighteen million, two hundred eighty-five thousand, six hundred four".