813560 has 48 divisors (see below), whose sum is σ = 2044440. Its totient is φ = 288960.

The previous prime is 813559. The next prime is 813577. The reversal of 813560 is 65318.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 18899 + ... + 18941.

2⁸¹³⁵⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 813560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022220).

813560 is an abundant number, since it is smaller than the sum of its proper divisors (1230880).

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

813560 is a wasteful number, since it uses less digits than its factorization.

813560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 813560 is about 901.9756094263. The cubic root of 813560 is about 93.3533403822.

Adding to 813560 its reverse (65318), we get a palindrome (878878).

The spelling of 813560 in words is "eight hundred thirteen thousand, five hundred sixty".