647245 has 4 divisors (see below), whose sum is σ = 776700. Its totient is φ = 517792.

The previous prime is 647219. The next prime is 647261. The reversal of 647245 is 542746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101124 + 546121 = 318^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 647245 - 2⁷ = 647117 is a prime.

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, 64720 + ... + 64729.

It is an arithmetic number, because the mean of its divisors is an integer number (194175).

2⁶⁴⁷²⁴⁵ is an apocalyptic number.

It is an amenable number.

647245 is a deficient number, since it is larger than the sum of its proper divisors (129455).

647245 is a wasteful number, since it uses less digits than its factorization.

647245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129454.

The product of its digits is 6720, while the sum is 28.

The square root of 647245 is about 804.5153820779. The cubic root of 647245 is about 86.5013531814.

The spelling of 647245 in words is "six hundred forty-seven thousand, two hundred forty-five".