706880809 has 4 divisors (see below), whose sum is σ = 714823380. Its totient is φ = 698938240.

The previous prime is 706880789. The next prime is 706880821. The reversal of 706880809 is 908088607.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 161798400 + 545082409 = 12720^2 + 23347^2 .

It is a cyclic number.

It is not a de Polignac number, because 706880809 - 2⁵ = 706880777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (706880869) 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, 3971152 + ... + 3971329.

It is an arithmetic number, because the mean of its divisors is an integer number (178705845).

Almost surely, 2^706880809 is an apocalyptic number.

It is an amenable number.

706880809 is a deficient number, since it is larger than the sum of its proper divisors (7942571).

706880809 is an equidigital number, since it uses as much as digits as its factorization.

706880809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7942570.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 706880809 is about 26587.2301866892. The cubic root of 706880809 is about 890.8038056576.

The spelling of 706880809 in words is "seven hundred six million, eight hundred eighty thousand, eight hundred nine".