164521812 has 72 divisors (see below), whose sum is σ = 480932256. Its totient is φ = 43388352.

The previous prime is 164521787. The next prime is 164521823. The reversal of 164521812 is 218125461.

It is a self number, because there is not a number n which added to its sum of digits gives 164521812.

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, 3118 + ... + 18405.

Almost surely, 2^164521812 is an apocalyptic number.

164521812 is a gapful number since it is divisible by the number (12) 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 164521812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240466128).

164521812 is an abundant number, since it is smaller than the sum of its proper divisors (316410444).

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

164521812 is a wasteful number, since it uses less digits than its factorization.

164521812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21557 (or 21548 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 164521812 is about 12826.6056304854. The cubic root of 164521812 is about 547.9502903033.

The spelling of 164521812 in words is "one hundred sixty-four million, five hundred twenty-one thousand, eight hundred twelve".