7817166228 has 12 divisors (see below), whose sum is σ = 18240054560. Its totient is φ = 2605722072.

The previous prime is 7817166223. The next prime is 7817166229. The reversal of 7817166228 is 8226617187.

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

It is a super-2 number, since 2×7817166228² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7817166223) 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, 325715248 + ... + 325715271.

Almost surely, 2^7817166228 is an apocalyptic number.

It is an amenable number.

7817166228 is an abundant number, since it is smaller than the sum of its proper divisors (10422888332).

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

7817166228 is a wasteful number, since it uses less digits than its factorization.

7817166228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651430526 (or 651430524 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 7817166228 is about 88414.7398797282. The cubic root of 7817166228 is about 1984.6462856809.

The spelling of 7817166228 in words is "seven billion, eight hundred seventeen million, one hundred sixty-six thousand, two hundred twenty-eight".