172328957 has 4 divisors (see below), whose sum is σ = 173939616. Its totient is φ = 170718300.

The previous prime is 172328953. The next prime is 172328971. The reversal of 172328957 is 759823271.

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: 759823271 = 9859 ⋅77069.

It is a cyclic number.

It is not a de Polignac number, because 172328957 - 2² = 172328953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172328951) 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, 805169 + ... + 805382.

It is an arithmetic number, because the mean of its divisors is an integer number (43484904).

Almost surely, 2^172328957 is an apocalyptic number.

It is an amenable number.

172328957 is a deficient number, since it is larger than the sum of its proper divisors (1610659).

172328957 is a wasteful number, since it uses less digits than its factorization.

172328957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610658.

The product of its digits is 211680, while the sum is 44.

The square root of 172328957 is about 13127.4124259124. The cubic root of 172328957 is about 556.4840911447.

The spelling of 172328957 in words is "one hundred seventy-two million, three hundred twenty-eight thousand, nine hundred fifty-seven".