218728836 has 60 divisors (see below), whose sum is σ = 601912080. Its totient is φ = 69070320.

The previous prime is 218728823. The next prime is 218728841. The reversal of 218728836 is 638827812.

It is a junction number, because it is equal to n+sod(n) for n = 218728791 and 218728800.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11610 + ... + 23921.

It is an arithmetic number, because the mean of its divisors is an integer number (10031868).

Almost surely, 2^218728836 is an apocalyptic number.

It is an amenable number.

218728836 is an abundant number, since it is smaller than the sum of its proper divisors (383183244).

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

218728836 is a wasteful number, since it uses less digits than its factorization.

218728836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35566 (or 35555 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 218728836 is about 14789.4839666568. The cubic root of 218728836 is about 602.5161337025.

The spelling of 218728836 in words is "two hundred eighteen million, seven hundred twenty-eight thousand, eight hundred thirty-six".