647860 has 24 divisors (see below), whose sum is σ = 1408680. Its totient is φ = 249984.

The previous prime is 647851. The next prime is 647861. The reversal of 647860 is 68746.

647860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1444 + 646416 = 38^2 + 804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647861) by changing a digit.

647860 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 7 ways as a sum of consecutive naturals, for example, 22 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (58695).

2⁶⁴⁷⁸⁶⁰ 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 647860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704340).

647860 is an abundant number, since it is smaller than the sum of its proper divisors (760820).

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

647860 is a wasteful number, since it uses less digits than its factorization.

647860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 647860 is about 804.8975090035. The cubic root of 647860 is about 86.5287418270.

The spelling of 647860 in words is "six hundred forty-seven thousand, eight hundred sixty".