217448090 has 32 divisors (see below), whose sum is σ = 406373760. Its totient is φ = 83675200.

The previous prime is 217448089. The next prime is 217448107. The reversal of 217448090 is 90844712.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 217448090.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88985 + ... + 91395.

It is an arithmetic number, because the mean of its divisors is an integer number (12699180).

Almost surely, 2^217448090 is an apocalyptic number.

217448090 is a deficient number, since it is larger than the sum of its proper divisors (188925670).

217448090 is a wasteful number, since it uses less digits than its factorization.

217448090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 217448090 is about 14746.1211849083. The cubic root of 217448090 is about 601.3378388357.

The spelling of 217448090 in words is "two hundred seventeen million, four hundred forty-eight thousand, ninety".