817628172 has 12 divisors (see below), whose sum is σ = 1907799096. Its totient is φ = 272542720.

The previous prime is 817628171. The next prime is 817628213. The reversal of 817628172 is 271826718.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×817628172³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (817628171) 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, 34067829 + ... + 34067852.

It is an arithmetic number, because the mean of its divisors is an integer number (158983258).

Almost surely, 2^817628172 is an apocalyptic number.

It is an amenable number.

817628172 is an abundant number, since it is smaller than the sum of its proper divisors (1090170924).

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

817628172 is a wasteful number, since it uses less digits than its factorization.

817628172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68135688 (or 68135686 counting only the distinct ones).

The product of its digits is 75264, while the sum is 42.

The square root of 817628172 is about 28594.1982227164. The cubic root of 817628172 is about 935.0868486725.

The spelling of 817628172 in words is "eight hundred seventeen million, six hundred twenty-eight thousand, one hundred seventy-two".