172728473 has 2 divisors, whose sum is σ = 172728474. Its totient is φ = 172728472.

The previous prime is 172728461. The next prime is 172728511. The reversal of 172728473 is 374827271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110838784 + 61889689 = 10528^2 + 7867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172728473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172728473.

It is not a weakly prime, because it can be changed into another prime (172728403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86364236 + 86364237.

It is an arithmetic number, because the mean of its divisors is an integer number (86364237).

Almost surely, 2^172728473 is an apocalyptic number.

It is an amenable number.

172728473 is a deficient number, since it is larger than the sum of its proper divisors (1).

172728473 is an equidigital number, since it uses as much as digits as its factorization.

172728473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131712, while the sum is 41.

The square root of 172728473 is about 13142.6204769064. The cubic root of 172728473 is about 556.9137978245.

The spelling of 172728473 in words is "one hundred seventy-two million, seven hundred twenty-eight thousand, four hundred seventy-three".