172800505 has 4 divisors (see below), whose sum is σ = 207360612. Its totient is φ = 138240400.

The previous prime is 172800493. The next prime is 172800517. The reversal of 172800505 is 505008271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505008271 = 83 ⋅6084437.

It is an interprime number because it is at equal distance from previous prime (172800493) and next prime (172800517).

It can be written as a sum of positive squares in 2 ways, for example, as 109056249 + 63744256 = 10443^2 + 7984^2 .

It is not a de Polignac number, because 172800505 - 2⁹ = 172799993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17280046 + ... + 17280055.

It is an arithmetic number, because the mean of its divisors is an integer number (51840153).

Almost surely, 2^172800505 is an apocalyptic number.

It is an amenable number.

172800505 is a deficient number, since it is larger than the sum of its proper divisors (34560107).

172800505 is an equidigital number, since it uses as much as digits as its factorization.

172800505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34560106.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 172800505 is about 13145.3605884358. The cubic root of 172800505 is about 556.9912026261.

Adding to 172800505 its reverse (505008271), we get a palindrome (677808776).

The spelling of 172800505 in words is "one hundred seventy-two million, eight hundred thousand, five hundred five".