172728493 has 4 divisors (see below), whose sum is σ = 197404000. Its totient is φ = 148052988.

The previous prime is 172728473. The next prime is 172728511. The reversal of 172728493 is 394827271.

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.

It is a cyclic number.

It is not a de Polignac number, because 172728493 - 2⁵ = 172728461 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 (172728403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12337743 + ... + 12337756.

It is an arithmetic number, because the mean of its divisors is an integer number (49351000).

Almost surely, 2^172728493 is an apocalyptic number.

It is an amenable number.

172728493 is a deficient number, since it is larger than the sum of its proper divisors (24675507).

172728493 is an equidigital number, since it uses as much as digits as its factorization.

172728493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24675506.

The product of its digits is 169344, while the sum is 43.

The square root of 172728493 is about 13142.6212377897. The cubic root of 172728493 is about 556.9138193193.

The spelling of 172728493 in words is "one hundred seventy-two million, seven hundred twenty-eight thousand, four hundred ninety-three".