165212720 has 40 divisors (see below), whose sum is σ = 384725376. Its totient is φ = 65980928.

The previous prime is 165212701. The next prime is 165212731. The reversal of 165212720 is 27212561.

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

It is a self number, because there is not a number n which added to its sum of digits gives 165212720.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67844 + ... + 70236.

Almost surely, 2^165212720 is an apocalyptic number.

165212720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165212720 is an abundant number, since it is smaller than the sum of its proper divisors (219512656).

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

165212720 is a wasteful number, since it uses less digits than its factorization.

165212720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3269 (or 3263 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 165212720 is about 12853.5100264480. The cubic root of 165212720 is about 548.7162566618.

The spelling of 165212720 in words is "one hundred sixty-five million, two hundred twelve thousand, seven hundred twenty".