172828489 has 8 divisors (see below), whose sum is σ = 178873128. Its totient is φ = 166871040.

The previous prime is 172828483. The next prime is 172828507. The reversal of 172828489 is 984828271.

It can be written as a sum of positive squares in 4 ways, for example, as 2917264 + 169911225 = 1708^2 + 13035^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-172828489 is a prime.

It is a super-2 number, since 2×172828489² = 59739373220046242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172828483) 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 7 ways as a sum of consecutive naturals, for example, 17752 + ... + 25705.

It is an arithmetic number, because the mean of its divisors is an integer number (22359141).

Almost surely, 2^172828489 is an apocalyptic number.

It is an amenable number.

172828489 is a deficient number, since it is larger than the sum of its proper divisors (6044639).

172828489 is an equidigital number, since it uses as much as digits as its factorization.

172828489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43595.

The product of its digits is 516096, while the sum is 49.

The square root of 172828489 is about 13146.4249512938. The cubic root of 172828489 is about 557.0212681256.

The spelling of 172828489 in words is "one hundred seventy-two million, eight hundred twenty-eight thousand, four hundred eighty-nine".