165638028 has 12 divisors (see below), whose sum is σ = 386488760. Its totient is φ = 55212672.

The previous prime is 165638017. The next prime is 165638051. The reversal of 165638028 is 820836561.

It is a happy number.

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

It is a super-3 number, since 3×165638028³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6901573 + ... + 6901596.

Almost surely, 2^165638028 is an apocalyptic number.

It is an amenable number.

165638028 is an abundant number, since it is smaller than the sum of its proper divisors (220850732).

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

165638028 is a wasteful number, since it uses less digits than its factorization.

165638028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13803176 (or 13803174 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 165638028 is about 12870.0438227692. The cubic root of 165638028 is about 549.1867076083.

The spelling of 165638028 in words is "one hundred sixty-five million, six hundred thirty-eight thousand, twenty-eight".