165570228 has 18 divisors (see below), whose sum is σ = 418524834. Its totient is φ = 55190064.

The previous prime is 165570221. The next prime is 165570233. The reversal of 165570228 is 822075561.

It is a happy number.

165570228 is a `hidden beast` number, since 1 + 65 + 570 + 2 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 165328164 + 242064 = 12858^2 + 492^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4599173 = 165570228 / (1 + 6 + 5 + 5 + 7 + 0 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 165570192 and 165570201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165570221) 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, 2299551 + ... + 2299622.

Almost surely, 2^165570228 is an apocalyptic number.

165570228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

165570228 is an abundant number, since it is smaller than the sum of its proper divisors (252954606).

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

165570228 is a wasteful number, since it uses less digits than its factorization.

165570228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4599183 (or 4599178 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 165570228 is about 12867.4095295052. The cubic root of 165570228 is about 549.1117651956. Note that the first 3 decimals are identical.

The spelling of 165570228 in words is "one hundred sixty-five million, five hundred seventy thousand, two hundred twenty-eight".