647660 has 48 divisors (see below), whose sum is σ = 1524096. Its totient is φ = 229632.

The previous prime is 647659. The next prime is 647663. The reversal of 647660 is 66746.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647660.

It is not an unprimeable number, because it can be changed into a prime (647663) 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 15 ways as a sum of consecutive naturals, for example, 12194 + ... + 12246.

It is an arithmetic number, because the mean of its divisors is an integer number (31752).

2⁶⁴⁷⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762048).

647660 is an abundant number, since it is smaller than the sum of its proper divisors (876436).

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

647660 is a wasteful number, since it uses less digits than its factorization.

647660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 120 counting only the distinct ones).

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

The square root of 647660 is about 804.7732599931. The cubic root of 647660 is about 86.5198368529.

The spelling of 647660 in words is "six hundred forty-seven thousand, six hundred sixty".