647044 has 6 divisors (see below), whose sum is σ = 1132334. Its totient is φ = 323520.

The previous prime is 647039. The next prime is 647047. The reversal of 647044 is 440746.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 102400 = 738^2 + 320^2 .

It is not an unprimeable number, because it can be changed into a prime (647047) by changing a digit.

647044 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80877 + ... + 80884.

2⁶⁴⁷⁰⁴⁴ is an apocalyptic number.

It is an amenable number.

647044 is a deficient number, since it is larger than the sum of its proper divisors (485290).

647044 is a wasteful number, since it uses less digits than its factorization.

647044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161765 (or 161763 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 647044 is about 804.3904524545. The cubic root of 647044 is about 86.4923980088.

The spelling of 647044 in words is "six hundred forty-seven thousand, forty-four".