809730645 has 16 divisors (see below), whose sum is σ = 1311970560. Its totient is φ = 426389184.

The previous prime is 809730643. The next prime is 809730659. The reversal of 809730645 is 546037908.

It is a happy number.

It is not a de Polignac number, because 809730645 - 2¹ = 809730643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 809730597 and 809730606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809730643) by changing a digit.

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, 340474 + ... + 342843.

It is an arithmetic number, because the mean of its divisors is an integer number (81998160).

Almost surely, 2^809730645 is an apocalyptic number.

It is an amenable number.

809730645 is a deficient number, since it is larger than the sum of its proper divisors (502239915).

809730645 is a wasteful number, since it uses less digits than its factorization.

809730645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683404.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 809730645 is about 28455.7664630563. The cubic root of 809730645 is about 932.0664133416.

The spelling of 809730645 in words is "eight hundred nine million, seven hundred thirty thousand, six hundred forty-five".