647730 has 32 divisors (see below), whose sum is σ = 1728000. Its totient is φ = 172656.

The previous prime is 647723. The next prime is 647741. The reversal of 647730 is 37746.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 647694 and 647703.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647730.

It is an unprimeable number.

647730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 930 + ... + 1469.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2⁶⁴⁷⁷³⁰ is an apocalyptic number.

647730 is an abundant number, since it is smaller than the sum of its proper divisors (1080270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647730 is a wasteful number, since it uses less digits than its factorization.

647730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415 (or 2409 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 647730 is about 804.8167493287. The cubic root of 647730 is about 86.5229538024.

The spelling of 647730 in words is "six hundred forty-seven thousand, seven hundred thirty".