216223988 has 6 divisors (see below), whose sum is σ = 378391986. Its totient is φ = 108111992.

The previous prime is 216223981. The next prime is 216224051. The reversal of 216223988 is 889322612.

216223988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 167391844 + 48832144 = 12938^2 + 6988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216223981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27027995 + ... + 27028002.

It is an arithmetic number, because the mean of its divisors is an integer number (63065331).

Almost surely, 2^216223988 is an apocalyptic number.

It is an amenable number.

216223988 is a deficient number, since it is larger than the sum of its proper divisors (162167998).

216223988 is a wasteful number, since it uses less digits than its factorization.

216223988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54056001 (or 54055999 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 216223988 is about 14704.5567087213. The cubic root of 216223988 is about 600.2073246489.

The spelling of 216223988 in words is "two hundred sixteen million, two hundred twenty-three thousand, nine hundred eighty-eight".