165810228 has 12 divisors (see below), whose sum is σ = 386890560. Its totient is φ = 55270072.

The previous prime is 165810223. The next prime is 165810257. The reversal of 165810228 is 822018561.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165810223) 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, 6908748 + ... + 6908771.

It is an arithmetic number, because the mean of its divisors is an integer number (32240880).

Almost surely, 2^165810228 is an apocalyptic number.

It is an amenable number.

165810228 is an abundant number, since it is smaller than the sum of its proper divisors (221080332).

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

165810228 is a wasteful number, since it uses less digits than its factorization.

165810228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13817526 (or 13817524 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 165810228 is about 12876.7320388366. The cubic root of 165810228 is about 549.3769561861.

Adding to 165810228 its reverse (822018561), we get a palindrome (987828789).

The spelling of 165810228 in words is "one hundred sixty-five million, eight hundred ten thousand, two hundred twenty-eight".