647556 has 48 divisors (see below), whose sum is σ = 1862784. Its totient is φ = 170496.

The previous prime is 647551. The next prime is 647557. The reversal of 647556 is 655746.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (647551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 796 + ... + 1388.

It is an arithmetic number, because the mean of its divisors is an integer number (38808).

2⁶⁴⁷⁵⁵⁶ 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 647556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931392).

647556 is an abundant number, since it is smaller than the sum of its proper divisors (1215228).

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

647556 is a wasteful number, since it uses less digits than its factorization.

647556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 618 counting only the distinct ones).

The product of its digits is 25200, while the sum is 33.

The square root of 647556 is about 804.7086429261. The cubic root of 647556 is about 86.5152055419.

The spelling of 647556 in words is "six hundred forty-seven thousand, five hundred fifty-six".