170428172 has 12 divisors (see below), whose sum is σ = 298551960. Its totient is φ = 85127616.

The previous prime is 170428171. The next prime is 170428189. The reversal of 170428172 is 271824071.

It is a happy number.

It is a super-3 number, since 3×170428172³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (170428171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17078 + ... + 25149.

It is an arithmetic number, because the mean of its divisors is an integer number (24879330).

Almost surely, 2^170428172 is an apocalyptic number.

It is an amenable number.

170428172 is a deficient number, since it is larger than the sum of its proper divisors (128123788).

170428172 is a wasteful number, since it uses less digits than its factorization.

170428172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43240 (or 43238 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 170428172 is about 13054.8141311931. The cubic root of 170428172 is about 554.4305193968.

The spelling of 170428172 in words is "one hundred seventy million, four hundred twenty-eight thousand, one hundred seventy-two".