217028120 has 32 divisors (see below), whose sum is σ = 517039200. Its totient is φ = 81704448.

The previous prime is 217028111. The next prime is 217028153. The reversal of 217028120 is 21820712.

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, 158900 + ... + 160259.

It is an arithmetic number, because the mean of its divisors is an integer number (16157475).

Almost surely, 2^217028120 is an apocalyptic number.

217028120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217028120 is an abundant number, since it is smaller than the sum of its proper divisors (300011080).

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

217028120 is a wasteful number, since it uses less digits than its factorization.

217028120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319187 (or 319183 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 217028120 is about 14731.8742867294. The cubic root of 217028120 is about 600.9504565552.

Adding to 217028120 its reverse (21820712), we get a palindrome (238848832).

The spelling of 217028120 in words is "two hundred seventeen million, twenty-eight thousand, one hundred twenty".