647966 has 8 divisors (see below), whose sum is σ = 1060344. Its totient is φ = 294520.

The previous prime is 647963. The next prime is 647987. The reversal of 647966 is 669746.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647963) 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, 14705 + ... + 14748.

It is an arithmetic number, because the mean of its divisors is an integer number (132543).

2⁶⁴⁷⁹⁶⁶ is an apocalyptic number.

647966 is a deficient number, since it is larger than the sum of its proper divisors (412378).

647966 is a wasteful number, since it uses less digits than its factorization.

647966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29466.

The product of its digits is 54432, while the sum is 38.

The square root of 647966 is about 804.9633532031. The cubic root of 647966 is about 86.5334607202.

The spelling of 647966 in words is "six hundred forty-seven thousand, nine hundred sixty-six".