647066 has 8 divisors (see below), whose sum is σ = 1109280. Its totient is φ = 277308.

The previous prime is 647057. The next prime is 647069. The reversal of 647066 is 660746.

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

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (647069) by changing a digit.

647066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23096 + ... + 23123.

It is an arithmetic number, because the mean of its divisors is an integer number (138660).

2⁶⁴⁷⁰⁶⁶ is an apocalyptic number.

647066 is a deficient number, since it is larger than the sum of its proper divisors (462214).

647066 is a wasteful number, since it uses less digits than its factorization.

647066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46228.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 647066 is about 804.4041272893. The cubic root of 647066 is about 86.4933782673.

The spelling of 647066 in words is "six hundred forty-seven thousand, sixty-six".