718820 has 24 divisors (see below), whose sum is σ = 1526784. Its totient is φ = 284256.

The previous prime is 718813. The next prime is 718841. The reversal of 718820 is 28817.

It is a self number, because there is not a number n which added to its sum of digits gives 718820.

It is an unprimeable number.

718820 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 2399 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (63616).

2⁷¹⁸⁸²⁰ is an apocalyptic number.

It is an amenable number.

718820 is an abundant number, since it is smaller than the sum of its proper divisors (807964).

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

718820 is a wasteful number, since it uses less digits than its factorization.

718820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 417 counting only the distinct ones).

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

The square root of 718820 is about 847.8325306333. The cubic root of 718820 is about 89.5791046619.

The spelling of 718820 in words is "seven hundred eighteen thousand, eight hundred twenty".