171720642 has 8 divisors (see below), whose sum is σ = 343441296. Its totient is φ = 57240212.

The previous prime is 171720623. The next prime is 171720667. The reversal of 171720642 is 246027171.

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

171720642 is an admirable number.

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, 14310048 + ... + 14310059.

It is an arithmetic number, because the mean of its divisors is an integer number (42930162).

Almost surely, 2^171720642 is an apocalyptic number.

171720642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171720642 is a wasteful number, since it uses less digits than its factorization.

171720642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28620112.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 171720642 is about 13104.2222966493. Note that the first 4 decimals coincide. The cubic root of 171720642 is about 555.8285295817.

The spelling of 171720642 in words is "one hundred seventy-one million, seven hundred twenty thousand, six hundred forty-two".