805720 has 16 divisors (see below), whose sum is σ = 1812960. Its totient is φ = 322272.

The previous prime is 805711. The next prime is 805723. The reversal of 805720 is 27508.

It is a super-3 number, since 3×805720³ = 1569183333927744000, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 805691 and 805700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805723) 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, 10032 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (113310).

2⁸⁰⁵⁷²⁰ is an apocalyptic number.

It is an amenable number.

805720 is an abundant number, since it is smaller than the sum of its proper divisors (1007240).

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

805720 is a wasteful number, since it uses less digits than its factorization.

805720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20154 (or 20150 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 805720 is about 897.6190728811. The cubic root of 805720 is about 93.0525005144.

The spelling of 805720 in words is "eight hundred five thousand, seven hundred twenty".