172689643 has 8 divisors (see below), whose sum is σ = 197439488. Its totient is φ = 147959784.

The previous prime is 172689641. The next prime is 172689653. The reversal of 172689643 is 346986271.

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

It is not a de Polignac number, because 172689643 - 2¹ = 172689641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172689593 and 172689602.

It is not an unprimeable number, because it can be changed into a prime (172689641) 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, 28630 + ... + 34132.

It is an arithmetic number, because the mean of its divisors is an integer number (24679936).

Almost surely, 2^172689643 is an apocalyptic number.

172689643 is a deficient number, since it is larger than the sum of its proper divisors (24749845).

172689643 is an equidigital number, since it uses as much as digits as its factorization.

172689643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9993.

The product of its digits is 435456, while the sum is 46.

The square root of 172689643 is about 13141.1431390119. The cubic root of 172689643 is about 556.8720626026.

The spelling of 172689643 in words is "one hundred seventy-two million, six hundred eighty-nine thousand, six hundred forty-three".