217542308 has 12 divisors (see below), whose sum is σ = 380999472. Its totient is φ = 108685320.

The previous prime is 217542307. The next prime is 217542317. The reversal of 217542308 is 803245712.

It is not an unprimeable number, because it can be changed into a prime (217542301) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 15578 + ... + 26033.

It is an arithmetic number, because the mean of its divisors is an integer number (31749956).

Almost surely, 2^217542308 is an apocalyptic number.

It is an amenable number.

217542308 is a deficient number, since it is larger than the sum of its proper divisors (163457164).

217542308 is a wasteful number, since it uses less digits than its factorization.

217542308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42922 (or 42920 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 217542308 is about 14749.3155095415. The cubic root of 217542308 is about 601.4246774425.

The spelling of 217542308 in words is "two hundred seventeen million, five hundred forty-two thousand, three hundred eight".