165779320 has 128 divisors (see below), whose sum is σ = 447897600. Its totient is φ = 54028800.

The previous prime is 165779311. The next prime is 165779333. The reversal of 165779320 is 23977561.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 616146 + ... + 616414.

It is an arithmetic number, because the mean of its divisors is an integer number (3499200).

Almost surely, 2^165779320 is an apocalyptic number.

165779320 is a gapful number since it is divisible by the number (10) 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 165779320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223948800).

165779320 is an abundant number, since it is smaller than the sum of its proper divisors (282118280).

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

165779320 is a wasteful number, since it uses less digits than its factorization.

165779320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 165779320 is about 12875.5318336758. The cubic root of 165779320 is about 549.3428183682.

The spelling of 165779320 in words is "one hundred sixty-five million, seven hundred seventy-nine thousand, three hundred twenty".