218906888 has 12 divisors (see below), whose sum is σ = 410528895. Its totient is φ = 109432520.

The previous prime is 218906887. The next prime is 218906899. The reversal of 218906888 is 888609812.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 109453444 + 109453444 = 10462^2 + 10462^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=10462.

It is a super-2 number, since 2×218906888² = 95840451227689088, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218906887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 39233 + ... + 44463.

Almost surely, 2^218906888 is an apocalyptic number.

It is an amenable number.

218906888 is a deficient number, since it is larger than the sum of its proper divisors (191622007).

218906888 is an frugal number, since it uses more digits than its factorization.

218906888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10468 (or 5233 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 50.

The square root of 218906888 is about 14795.5022895473. The cubic root of 218906888 is about 602.6795782491.

Multiplying 218906888 by its sum of digits (50), we get a square (10945344400 = 104620²).

The spelling of 218906888 in words is "two hundred eighteen million, nine hundred six thousand, eight hundred eighty-eight".