172671643 has 8 divisors (see below), whose sum is σ = 180500480. Its totient is φ = 164984040.

The previous prime is 172671641. The next prime is 172671673. The reversal of 172671643 is 346176271.

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

It is a cyclic number.

It is not a de Polignac number, because 172671643 - 2¹ = 172671641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172671641) 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, 32805 + ... + 37702.

It is an arithmetic number, because the mean of its divisors is an integer number (22562560).

Almost surely, 2^172671643 is an apocalyptic number.

172671643 is a deficient number, since it is larger than the sum of its proper divisors (7828837).

172671643 is an equidigital number, since it uses as much as digits as its factorization.

172671643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70617.

The product of its digits is 42336, while the sum is 37.

The square root of 172671643 is about 13140.4582492393. The cubic root of 172671643 is about 556.8527137383.

The spelling of 172671643 in words is "one hundred seventy-two million, six hundred seventy-one thousand, six hundred forty-three".