171720052 has 24 divisors (see below), whose sum is σ = 344965824. Its totient is φ = 73267392.

The previous prime is 171720041. The next prime is 171720061. The reversal of 171720052 is 250027171.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 171719999 and 171720026.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7153 + ... + 19864.

It is an arithmetic number, because the mean of its divisors is an integer number (14373576).

Almost surely, 2^171720052 is an apocalyptic number.

It is an amenable number.

171720052 is an abundant number, since it is smaller than the sum of its proper divisors (173245772).

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

171720052 is a wasteful number, since it uses less digits than its factorization.

171720052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27255 (or 27253 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 171720052 is about 13104.1997848018. The cubic root of 171720052 is about 555.8278930067.

The spelling of 171720052 in words is "one hundred seventy-one million, seven hundred twenty thousand, fifty-two".