165210228 has 18 divisors (see below), whose sum is σ = 417614834. Its totient is φ = 55070064.

The previous prime is 165210223. The next prime is 165210259. The reversal of 165210228 is 822012561.

It is a happy number.

165210228 is a `hidden beast` number, since 1 + 652 + 1 + 0 + 2 + 2 + 8 = 666.

165210228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 100761444 + 64448784 = 10038^2 + 8028^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165210223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2294551 + ... + 2294622.

Almost surely, 2^165210228 is an apocalyptic number.

165210228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

165210228 is an abundant number, since it is smaller than the sum of its proper divisors (252404606).

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

165210228 is a wasteful number, since it uses less digits than its factorization.

165210228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4589183 (or 4589178 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 165210228 is about 12853.4130875811. The cubic root of 165210228 is about 548.7134977787.

Adding to 165210228 its reverse (822012561), we get a palindrome (987222789).

The spelling of 165210228 in words is "one hundred sixty-five million, two hundred ten thousand, two hundred twenty-eight".