165808720 has 120 divisors (see below), whose sum is σ = 484468992. Its totient is φ = 51659520.

The previous prime is 165808711. The next prime is 165808733. The reversal of 165808720 is 27808561.

It is a self number, because there is not a number n which added to its sum of digits gives 165808720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66537 + ... + 68983.

Almost surely, 2^165808720 is an apocalyptic number.

165808720 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 165808720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242234496).

165808720 is an abundant number, since it is smaller than the sum of its proper divisors (318660272).

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

165808720 is a wasteful number, since it uses less digits than its factorization.

165808720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489 (or 2472 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 165808720 is about 12876.6734834739. The cubic root of 165808720 is about 549.3752907019.

The spelling of 165808720 in words is "one hundred sixty-five million, eight hundred eight thousand, seven hundred twenty".