165787320 has 64 divisors (see below), whose sum is σ = 499957920. Its totient is φ = 43979264.

The previous prime is 165787319. The next prime is 165787327. The reversal of 165787320 is 23787561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165787327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20134 + ... + 27146.

Almost surely, 2^165787320 is an apocalyptic number.

165787320 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 165787320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249978960).

165787320 is an abundant number, since it is smaller than the sum of its proper divisors (334170600).

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

165787320 is a wasteful number, since it uses less digits than its factorization.

165787320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7224 (or 7220 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 165787320 is about 12875.8424967068. The cubic root of 165787320 is about 549.3516547575.

The spelling of 165787320 in words is "one hundred sixty-five million, seven hundred eighty-seven thousand, three hundred twenty".