172006220208 has 40 divisors (see below), whose sum is σ = 454683114688. Its totient is φ = 56002024512.

The previous prime is 172006220207. The next prime is 172006220293. The reversal of 172006220208 is 802022600271.

It is a super-2 number, since 2×172006220208² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172006220207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41666110 + ... + 41670237.

Almost surely, 2^172006220208 is an apocalyptic number.

It is an amenable number.

172006220208 is an abundant number, since it is smaller than the sum of its proper divisors (282676894480).

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

172006220208 is a wasteful number, since it uses less digits than its factorization.

172006220208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83336401 (or 83336395 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

Adding to 172006220208 its reverse (802022600271), we get a palindrome (974028820479).

The spelling of 172006220208 in words is "one hundred seventy-two billion, six million, two hundred twenty thousand, two hundred eight".