217056885 has 32 divisors (see below), whose sum is σ = 363896832. Its totient is φ = 110341440.

The previous prime is 217056859. The next prime is 217056899. The reversal of 217056885 is 588650712.

It is not a de Polignac number, because 217056885 - 2⁶ = 217056821 is a prime.

It is a super-2 number, since 2×217056885² = 94227382651806450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27672 + ... + 34638.

It is an arithmetic number, because the mean of its divisors is an integer number (11371776).

Almost surely, 2^217056885 is an apocalyptic number.

It is an amenable number.

217056885 is a deficient number, since it is larger than the sum of its proper divisors (146839947).

217056885 is a wasteful number, since it uses less digits than its factorization.

217056885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073.

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 217056885 is about 14732.8505388469. The cubic root of 217056885 is about 600.9770054593.

The spelling of 217056885 in words is "two hundred seventeen million, fifty-six thousand, eight hundred eighty-five".