165541428 has 96 divisors (see below), whose sum is σ = 465758720. Its totient is φ = 50544000.

The previous prime is 165541423. The next prime is 165541447. The reversal of 165541428 is 824145561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 165541392 and 165541401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165541423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220053 + ... + 220803.

Almost surely, 2^165541428 is an apocalyptic number.

165541428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165541428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232879360).

165541428 is an abundant number, since it is smaller than the sum of its proper divisors (300217292).

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

165541428 is a wasteful number, since it uses less digits than its factorization.

165541428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 926 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 165541428 is about 12866.2903744630. The cubic root of 165541428 is about 549.0799250593.

Adding to 165541428 its reverse (824145561), we get a palindrome (989686989).

The spelling of 165541428 in words is "one hundred sixty-five million, five hundred forty-one thousand, four hundred twenty-eight".