172740055 has 4 divisors (see below), whose sum is σ = 207288072. Its totient is φ = 138192040.

The previous prime is 172740053. The next prime is 172740067. The reversal of 172740055 is 550047271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550047271 = 43 ⋅12791797.

It is not a de Polignac number, because 172740055 - 2¹ = 172740053 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172739999 and 172740026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172740053) 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, 17274001 + ... + 17274010.

It is an arithmetic number, because the mean of its divisors is an integer number (51822018).

Almost surely, 2^172740055 is an apocalyptic number.

172740055 is a deficient number, since it is larger than the sum of its proper divisors (34548017).

172740055 is an equidigital number, since it uses as much as digits as its factorization.

172740055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34548016.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 172740055 is about 13143.0610970200. The cubic root of 172740055 is about 556.9262451671.

The spelling of 172740055 in words is "one hundred seventy-two million, seven hundred forty thousand, fifty-five".