647705 has 8 divisors (see below), whose sum is σ = 781704. Its totient is φ = 515200.

The previous prime is 647693. The next prime is 647719. The reversal of 647705 is 507746.

It can be written as a sum of positive squares in 4 ways, for example, as 64009 + 583696 = 253^2 + 764^2 .

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

It is not a de Polignac number, because 647705 - 2⁶ = 647641 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1175 + ... + 1635.

It is an arithmetic number, because the mean of its divisors is an integer number (97713).

2⁶⁴⁷⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

647705 is a deficient number, since it is larger than the sum of its proper divisors (133999).

647705 is a wasteful number, since it uses less digits than its factorization.

647705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 647705 is about 804.8012176929. The cubic root of 647705 is about 86.5218406319.

The spelling of 647705 in words is "six hundred forty-seven thousand, seven hundred five".