805506840 has 48 divisors (see below), whose sum is σ = 2617898400. Its totient is φ = 214801728.

The previous prime is 805506811. The next prime is 805506847. The reversal of 805506840 is 48605508.

It is a happy number.

805506840 is a `hidden beast` number, since 8 + 0 + 550 + 68 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 805506795 and 805506804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805506847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1118400 + ... + 1119119.

It is an arithmetic number, because the mean of its divisors is an integer number (54539550).

Almost surely, 2^805506840 is an apocalyptic number.

It is an amenable number.

805506840 is an abundant number, since it is smaller than the sum of its proper divisors (1812391560).

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

805506840 is a wasteful number, since it uses less digits than its factorization.

805506840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237536 (or 2237529 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 805506840 is about 28381.4523941253. The cubic root of 805506840 is about 930.4429385017.

The spelling of 805506840 in words is "eight hundred five million, five hundred six thousand, eight hundred forty".