811720260 has 144 divisors (see below), whose sum is σ = 2685795840. Its totient is φ = 197233920.

The previous prime is 811720243. The next prime is 811720279. The reversal of 811720260 is 62027118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 182665 + ... + 187055.

It is an arithmetic number, because the mean of its divisors is an integer number (18651360).

Almost surely, 2^811720260 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 811720260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342897920).

811720260 is an abundant number, since it is smaller than the sum of its proper divisors (1874075580).

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

811720260 is a wasteful number, since it uses less digits than its factorization.

811720260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4498 (or 4493 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 811720260 is about 28490.7047999870. The cubic root of 811720260 is about 932.8291923059.

Adding to 811720260 its reverse (62027118), we get a palindrome (873747378).

The spelling of 811720260 in words is "eight hundred eleven million, seven hundred twenty thousand, two hundred sixty".