172520208 has 120 divisors (see below), whose sum is σ = 569693696. Its totient is φ = 47692800.

The previous prime is 172520207. The next prime is 172520219. The reversal of 172520208 is 802025271.

It is not an unprimeable number, because it can be changed into a prime (172520207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28488 + ... + 34008.

Almost surely, 2^172520208 is an apocalyptic number.

172520208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172520208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284846848).

172520208 is an abundant number, since it is smaller than the sum of its proper divisors (397173488).

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

172520208 is a wasteful number, since it uses less digits than its factorization.

172520208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573 (or 5564 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 172520208 is about 13134.6948194467. The cubic root of 172520208 is about 556.6898773992.

Adding to 172520208 its reverse (802025271), we get a palindrome (974545479).

The spelling of 172520208 in words is "one hundred seventy-two million, five hundred twenty thousand, two hundred eight".