647285 has 4 divisors (see below), whose sum is σ = 776748. Its totient is φ = 517824.

The previous prime is 647263. The next prime is 647293. The reversal of 647285 is 582746.

647285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 582746 = 2 ⋅291373.

It can be written as a sum of positive squares in 2 ways, for example, as 481636 + 165649 = 694^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 647285 - 2¹⁴ = 630901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64724 + ... + 64733.

It is an arithmetic number, because the mean of its divisors is an integer number (194187).

2⁶⁴⁷²⁸⁵ is an apocalyptic number.

It is an amenable number.

647285 is a deficient number, since it is larger than the sum of its proper divisors (129463).

647285 is a wasteful number, since it uses less digits than its factorization.

647285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129462.

The product of its digits is 13440, while the sum is 32.

The square root of 647285 is about 804.5402413801. The cubic root of 647285 is about 86.5031350841.

The spelling of 647285 in words is "six hundred forty-seven thousand, two hundred eighty-five".