218020028 has 24 divisors (see below), whose sum is σ = 403099200. Its totient is φ = 103009088.

The previous prime is 218020009. The next prime is 218020037. The reversal of 218020028 is 820020812.

It is a junction number, because it is equal to n+sod(n) for n = 218019985 and 218020012.

It is a congruent 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, 14543 + ... + 25446.

It is an arithmetic number, because the mean of its divisors is an integer number (16795800).

Almost surely, 2^218020028 is an apocalyptic number.

It is an amenable number.

218020028 is a deficient number, since it is larger than the sum of its proper divisors (185079172).

218020028 is a wasteful number, since it uses less digits than its factorization.

218020028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40069 (or 40067 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 218020028 is about 14765.5012783176. The cubic root of 218020028 is about 601.8645957649.

The spelling of 218020028 in words is "two hundred eighteen million, twenty thousand, twenty-eight".