172328257 has 4 divisors (see below), whose sum is σ = 172808640. Its totient is φ = 171847876.

The previous prime is 172328249. The next prime is 172328267. The reversal of 172328257 is 752823271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752823271 = 9851 ⋅76421.

It is a cyclic number.

It is not a de Polignac number, because 172328257 - 2³ = 172328249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172328267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239653 + ... + 240370.

It is an arithmetic number, because the mean of its divisors is an integer number (43202160).

Almost surely, 2^172328257 is an apocalyptic number.

It is an amenable number.

172328257 is a deficient number, since it is larger than the sum of its proper divisors (480383).

172328257 is an equidigital number, since it uses as much as digits as its factorization.

172328257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480382.

The product of its digits is 47040, while the sum is 37.

The square root of 172328257 is about 13127.3857641192. The cubic root of 172328257 is about 556.4833376645.

The spelling of 172328257 in words is "one hundred seventy-two million, three hundred twenty-eight thousand, two hundred fifty-seven".