809552840 has 16 divisors (see below), whose sum is σ = 1821493980. Its totient is φ = 323821120.

The previous prime is 809552839. The next prime is 809552857. The reversal of 809552840 is 48255908.

It can be written as a sum of positive squares in 2 ways, for example, as 697065604 + 112487236 = 26402^2 + 10606^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10119371 + ... + 10119450.

Almost surely, 2^809552840 is an apocalyptic number.

It is an amenable number.

809552840 is an abundant number, since it is smaller than the sum of its proper divisors (1011941140).

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

809552840 is a wasteful number, since it uses less digits than its factorization.

809552840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20238832 (or 20238828 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 809552840 is about 28452.6420565824. The cubic root of 809552840 is about 931.9981856326.

The spelling of 809552840 in words is "eight hundred nine million, five hundred fifty-two thousand, eight hundred forty".