805729820 has 48 divisors (see below), whose sum is σ = 1935433920. Its totient is φ = 276009984.

The previous prime is 805729819. The next prime is 805729843. The reversal of 805729820 is 28927508.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248852 + ... + 252068.

It is an arithmetic number, because the mean of its divisors is an integer number (40321540).

Almost surely, 2^805729820 is an apocalyptic number.

It is an amenable number.

805729820 is an abundant number, since it is smaller than the sum of its proper divisors (1129704100).

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

805729820 is a wasteful number, since it uses less digits than its factorization.

805729820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5022 (or 5020 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 805729820 is about 28385.3803920258. The cubic root of 805729820 is about 930.5287854969.

The spelling of 805729820 in words is "eight hundred five million, seven hundred twenty-nine thousand, eight hundred twenty".