165506428 has 12 divisors (see below), whose sum is σ = 289821672. Its totient is φ = 82700240.

The previous prime is 165506401. The next prime is 165506431. The reversal of 165506428 is 824605561.

It is a congruent number.

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, 5743 + ... + 19078.

It is an arithmetic number, because the mean of its divisors is an integer number (24151806).

Almost surely, 2^165506428 is an apocalyptic number.

It is an amenable number.

165506428 is a deficient number, since it is larger than the sum of its proper divisors (124315244).

165506428 is a wasteful number, since it uses less digits than its factorization.

165506428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26492 (or 26490 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 165506428 is about 12864.9301591575. The cubic root of 165506428 is about 549.0412254779.

The spelling of 165506428 in words is "one hundred sixty-five million, five hundred six thousand, four hundred twenty-eight".