217870052 has 6 divisors (see below), whose sum is σ = 381272598. Its totient is φ = 108935024.

The previous prime is 217870039. The next prime is 217870061. The reversal of 217870052 is 250078712.

It can be written as a sum of positive squares in only one way, i.e., 212459776 + 5410276 = 14576^2 + 2326^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27233753 + ... + 27233760.

It is an arithmetic number, because the mean of its divisors is an integer number (63545433).

Almost surely, 2^217870052 is an apocalyptic number.

It is an amenable number.

217870052 is a deficient number, since it is larger than the sum of its proper divisors (163402546).

217870052 is a wasteful number, since it uses less digits than its factorization.

217870052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54467517 (or 54467515 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 217870052 is about 14760.4218096909. The cubic root of 217870052 is about 601.7265565349.

The spelling of 217870052 in words is "two hundred seventeen million, eight hundred seventy thousand, fifty-two".