217728002 has 4 divisors (see below), whose sum is σ = 326592006. Its totient is φ = 108864000.

The previous prime is 217728001. The next prime is 217728037. The reversal of 217728002 is 200827712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 155775361 + 61952641 = 12481^2 + 7871^2 .

It is not an unprimeable number, because it can be changed into a prime (217728001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54431999 + ... + 54432002.

Almost surely, 2^217728002 is an apocalyptic number.

217728002 is a deficient number, since it is larger than the sum of its proper divisors (108864004).

217728002 is a wasteful number, since it uses less digits than its factorization.

217728002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108864003.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 217728002 is about 14755.6091707527. The cubic root of 217728002 is about 601.5957540378.

The spelling of 217728002 in words is "two hundred seventeen million, seven hundred twenty-eight thousand, two".