165780920 has 32 divisors (see below), whose sum is σ = 379127520. Its totient is φ = 65224320.

The previous prime is 165780919. The next prime is 165780929. The reversal of 165780920 is 29087561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165780929) 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, 31532 + ... + 36411.

It is an arithmetic number, because the mean of its divisors is an integer number (11847735).

Almost surely, 2^165780920 is an apocalyptic number.

165780920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165780920 is an abundant number, since it is smaller than the sum of its proper divisors (213346600).

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

165780920 is a wasteful number, since it uses less digits than its factorization.

165780920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68015 (or 68011 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 165780920 is about 12875.5939668817. The cubic root of 165780920 is about 549.3445856688.

The spelling of 165780920 in words is "one hundred sixty-five million, seven hundred eighty thousand, nine hundred twenty".