165732720 has 40 divisors (see below), whose sum is σ = 513772176. Its totient is φ = 44195328.

The previous prime is 165732713. The next prime is 165732737. The reversal of 165732720 is 27237561.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345037 + ... + 345516.

Almost surely, 2^165732720 is an apocalyptic number.

165732720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165732720 is an abundant number, since it is smaller than the sum of its proper divisors (348039456).

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

165732720 is a wasteful number, since it uses less digits than its factorization.

165732720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690569 (or 690563 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 165732720 is about 12873.7220725010. The cubic root of 165732720 is about 549.2913407485.

The spelling of 165732720 in words is "one hundred sixty-five million, seven hundred thirty-two thousand, seven hundred twenty".