1644160 has 64 divisors (see below), whose sum is σ = 4504320. Its totient is φ = 562176.

The previous prime is 1644143. The next prime is 1644163. The reversal of 1644160 is 614461.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×1644160³ = 13333786270629888000, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4297 + ... + 4663.

It is an arithmetic number, because the mean of its divisors is an integer number (70380).

2^1644160 is an apocalyptic number.

1644160 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 1644160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2252160).

1644160 is an abundant number, since it is smaller than the sum of its proper divisors (2860160).

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

1644160 is an equidigital number, since it uses as much as digits as its factorization.

1644160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1644160 is about 1282.2480259295. The cubic root of 1644160 is about 118.0269975572.

The spelling of 1644160 in words is "one million, six hundred forty-four thousand, one hundred sixty".