809680136 has 64 divisors (see below), whose sum is σ = 1648684800. Its totient is φ = 371520000.

The previous prime is 809680121. The next prime is 809680147. The reversal of 809680136 is 631086908.

It is a happy number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 809680093 and 809680102.

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 15 ways as a sum of consecutive naturals, for example, 1077761 + ... + 1078511.

It is an arithmetic number, because the mean of its divisors is an integer number (25760700).

Almost surely, 2^809680136 is an apocalyptic number.

It is an amenable number.

809680136 is an abundant number, since it is smaller than the sum of its proper divisors (839004664).

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

809680136 is a wasteful number, since it uses less digits than its factorization.

809680136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 986 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 809680136 is about 28454.8789489606. The cubic root of 809680136 is about 932.0470329375.

The spelling of 809680136 in words is "eight hundred nine million, six hundred eighty thousand, one hundred thirty-six".