172540506 has 16 divisors (see below), whose sum is σ = 345886848. Its totient is φ = 57379200.

The previous prime is 172540499. The next prime is 172540507. The reversal of 172540506 is 605045271.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172540507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30775 + ... + 35946.

It is an arithmetic number, because the mean of its divisors is an integer number (21617928).

Almost surely, 2^172540506 is an apocalyptic number.

172540506 is an abundant number, since it is smaller than the sum of its proper divisors (173346342).

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

172540506 is a wasteful number, since it uses less digits than its factorization.

172540506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67157.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 172540506 is about 13135.4674831161. The cubic root of 172540506 is about 556.7117091373.

Adding to 172540506 its reverse (605045271), we get a palindrome (777585777).

The spelling of 172540506 in words is "one hundred seventy-two million, five hundred forty thousand, five hundred six".