164640520 has 64 divisors (see below), whose sum is σ = 405440640. Its totient is φ = 59673600.

The previous prime is 164640517. The next prime is 164640521. The reversal of 164640520 is 25046461.

It is not an unprimeable number, because it can be changed into a prime (164640521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260605 + ... + 261235.

It is an arithmetic number, because the mean of its divisors is an integer number (6335010).

Almost surely, 2^164640520 is an apocalyptic number.

164640520 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 164640520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202720320).

164640520 is an abundant number, since it is smaller than the sum of its proper divisors (240800120).

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

164640520 is a wasteful number, since it uses less digits than its factorization.

164640520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 164640520 is about 12831.2322089502. The cubic root of 164640520 is about 548.0820467843.

Adding to 164640520 its reverse (25046461), we get a palindrome (189686981).

The spelling of 164640520 in words is "one hundred sixty-four million, six hundred forty thousand, five hundred twenty".