165231280 has 40 divisors (see below), whose sum is σ = 386319024. Its totient is φ = 65721600.

The previous prime is 165231223. The next prime is 165231281. The reversal of 165231280 is 82132561.

165231280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (165231281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8775 + ... + 20185.

Almost surely, 2^165231280 is an apocalyptic number.

165231280 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 165231280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193159512).

165231280 is an abundant number, since it is smaller than the sum of its proper divisors (221087744).

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

165231280 is a wasteful number, since it uses less digits than its factorization.

165231280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11605 (or 11599 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 165231280 is about 12854.2319879486. The cubic root of 165231280 is about 548.7368034906.

The spelling of 165231280 in words is "one hundred sixty-five million, two hundred thirty-one thousand, two hundred eighty".