706885721 has 8 divisors (see below), whose sum is σ = 748800360. Its totient is φ = 665008128.

The previous prime is 706885717. The next prime is 706885723. The reversal of 706885721 is 127588607.

It can be written as a sum of positive squares in 4 ways, for example, as 297390025 + 409495696 = 17245^2 + 20236^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 706885721 - 2² = 706885717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (706885723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36545 + ... + 52433.

It is an arithmetic number, because the mean of its divisors is an integer number (93600045).

Almost surely, 2^706885721 is an apocalyptic number.

It is an amenable number.

706885721 is a deficient number, since it is larger than the sum of its proper divisors (41914639).

706885721 is a wasteful number, since it uses less digits than its factorization.

706885721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18523.

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 706885721 is about 26587.3225617022. The cubic root of 706885721 is about 890.8058690032.

The spelling of 706885721 in words is "seven hundred six million, eight hundred eighty-five thousand, seven hundred twenty-one".