164365520 has 80 divisors (see below), whose sum is σ = 441453888. Its totient is φ = 56248320.

The previous prime is 164365517. The next prime is 164365541. The reversal of 164365520 is 25563461.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9467 + ... + 20453.

Almost surely, 2^164365520 is an apocalyptic number.

164365520 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 164365520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220726944).

164365520 is an abundant number, since it is smaller than the sum of its proper divisors (277088368).

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

164365520 is a wasteful number, since it uses less digits than its factorization.

164365520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11028 (or 11022 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 164365520 is about 12820.5116902564. The cubic root of 164365520 is about 547.7767218692.

The spelling of 164365520 in words is "one hundred sixty-four million, three hundred sixty-five thousand, five hundred twenty".