818720 has 96 divisors (see below), whose sum is σ = 2395008. Its totient is φ = 258048.

The previous prime is 818717. The next prime is 818723. The reversal of 818720 is 27818.

It is an interprime number because it is at equal distance from previous prime (818717) and next prime (818723).

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 818720.

It is not an unprimeable number, because it can be changed into a prime (818723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19019 + ... + 19061.

It is an arithmetic number, because the mean of its divisors is an integer number (24948).

2⁸¹⁸⁷²⁰ is an apocalyptic number.

818720 is a gapful number since it is divisible by the number (80) 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 818720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197504).

818720 is an abundant number, since it is smaller than the sum of its proper divisors (1576288).

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

818720 is a wasteful number, since it uses less digits than its factorization.

818720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 818720 is about 904.8314760219. The cubic root of 818720 is about 93.5502889414.

The spelling of 818720 in words is "eight hundred eighteen thousand, seven hundred twenty".