647040 has 64 divisors (see below), whose sum is σ = 2068560. Its totient is φ = 172032.

The previous prime is 647039. The next prime is 647047. The reversal of 647040 is 40746.

647040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 646998 and 647016.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1752 + ... + 2088.

2⁶⁴⁷⁰⁴⁰ is an apocalyptic number.

647040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034280).

647040 is an abundant number, since it is smaller than the sum of its proper divisors (1421520).

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

647040 is a wasteful number, since it uses less digits than its factorization.

647040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 647040 is about 804.3879660960. The cubic root of 647040 is about 86.4922197776.

Adding to 647040 its reverse (40746), we get a palindrome (687786).

The spelling of 647040 in words is "six hundred forty-seven thousand, forty".