807720009 has 4 divisors (see below), whose sum is σ = 1076960016. Its totient is φ = 538480004.

The previous prime is 807720007. The next prime is 807720013. The reversal of 807720009 is 900027708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 807720009 - 2¹ = 807720007 is a prime.

It is a super-2 number, since 2×807720009² = 1304823225877920162, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (807720007) 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 3 ways as a sum of consecutive naturals, for example, 134619999 + ... + 134620004.

It is an arithmetic number, because the mean of its divisors is an integer number (269240004).

Almost surely, 2^807720009 is an apocalyptic number.

It is an amenable number.

807720009 is a deficient number, since it is larger than the sum of its proper divisors (269240007).

807720009 is a wasteful number, since it uses less digits than its factorization.

807720009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269240006.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 807720009 is about 28420.4153558670. The cubic root of 807720009 is about 931.2943049113.

The spelling of 807720009 in words is "eight hundred seven million, seven hundred twenty thousand, nine".