172728994 has 8 divisors (see below), whose sum is σ = 259254828. Its totient is φ = 86310720.

The previous prime is 172728977. The next prime is 172729001. The reversal of 172728994 is 499827271.

It can be written as a sum of positive squares in 2 ways, for example, as 172580769 + 148225 = 13137^2 + 385^2 .

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

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, 22747 + ... + 29374.

Almost surely, 2^172728994 is an apocalyptic number.

172728994 is a deficient number, since it is larger than the sum of its proper divisors (86525834).

172728994 is a wasteful number, since it uses less digits than its factorization.

172728994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53780.

The product of its digits is 508032, while the sum is 49.

The square root of 172728994 is about 13142.6402979006. The cubic root of 172728994 is about 556.9143577627.

The spelling of 172728994 in words is "one hundred seventy-two million, seven hundred twenty-eight thousand, nine hundred ninety-four".