172728494 has 8 divisors (see below), whose sum is σ = 259180560. Its totient is φ = 86334976.

The previous prime is 172728473. The next prime is 172728511. The reversal of 172728494 is 494827271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×172728494³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 6314 + ... + 19629.

It is an arithmetic number, because the mean of its divisors is an integer number (32397570).

Almost surely, 2^172728494 is an apocalyptic number.

172728494 is a deficient number, since it is larger than the sum of its proper divisors (86452066).

172728494 is a wasteful number, since it uses less digits than its factorization.

172728494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29274.

The product of its digits is 225792, while the sum is 44.

The square root of 172728494 is about 13142.6212758338. The cubic root of 172728494 is about 556.9138203940.

The spelling of 172728494 in words is "one hundred seventy-two million, seven hundred twenty-eight thousand, four hundred ninety-four".