647620 has 12 divisors (see below), whose sum is σ = 1360044. Its totient is φ = 259040.

The previous prime is 647617. The next prime is 647627. The reversal of 647620 is 26746.

It can be written as a sum of positive squares in 2 ways, for example, as 315844 + 331776 = 562^2 + 576^2 .

It is not an unprimeable number, because it can be changed into a prime (647627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16171 + ... + 16210.

It is an arithmetic number, because the mean of its divisors is an integer number (113337).

2⁶⁴⁷⁶²⁰ is an apocalyptic number.

It is an amenable number.

647620 is an abundant number, since it is smaller than the sum of its proper divisors (712424).

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

647620 is a wasteful number, since it uses less digits than its factorization.

647620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32390 (or 32388 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 647620 is about 804.7484078891. The cubic root of 647620 is about 86.5180556381.

Adding to 647620 its product of nonzero digits (2016), we get a square (649636 = 806²).

The spelling of 647620 in words is "six hundred forty-seven thousand, six hundred twenty".