818560 has 32 divisors (see below), whose sum is σ = 1958400. Its totient is φ = 327168.

The previous prime is 818509. The next prime is 818561. The reversal of 818560 is 65818.

It is a happy number.

818560 is a nontrivial binomial coefficient, being equal to C(1280, 2).

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (61200).

2⁸¹⁸⁵⁶⁰ is an apocalyptic number.

818560 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

818560 is the 1279-th triangular number and also the 640-th hexagonal number.

818560 is the 427-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979200).

818560 is an abundant number, since it is smaller than the sum of its proper divisors (1139840).

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

818560 is a wasteful number, since it uses less digits than its factorization.

818560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298 (or 1286 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 818560 is about 904.7430574478. The cubic root of 818560 is about 93.5441944600.

It can be divided in two parts, 818 and 560, that added together give a triangular number (1378 = T₅₂).

The spelling of 818560 in words is "eight hundred eighteen thousand, five hundred sixty".