805780870 has 32 divisors (see below), whose sum is σ = 1487388672. Its totient is φ = 314127072.

The previous prime is 805780819. The next prime is 805780901. The reversal of 805780870 is 78087508.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 223099 + ... + 226681.

It is an arithmetic number, because the mean of its divisors is an integer number (46480896).

Almost surely, 2^805780870 is an apocalyptic number.

805780870 is a deficient number, since it is larger than the sum of its proper divisors (681607802).

805780870 is a wasteful number, since it uses less digits than its factorization.

805780870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 805780870 is about 28386.2796082896. The cubic root of 805780870 is about 930.5484374489.

The spelling of 805780870 in words is "eight hundred five million, seven hundred eighty thousand, eight hundred seventy".