647345 has 4 divisors (see below), whose sum is σ = 776820. Its totient is φ = 517872.

The previous prime is 647341. The next prime is 647357. The reversal of 647345 is 543746.

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 134689 + 512656 = 367^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 647345 - 2² = 647341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (647341) 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, 64730 + ... + 64739.

It is an arithmetic number, because the mean of its divisors is an integer number (194205).

2⁶⁴⁷³⁴⁵ is an apocalyptic number.

It is an amenable number.

647345 is a deficient number, since it is larger than the sum of its proper divisors (129475).

647345 is a wasteful number, since it uses less digits than its factorization.

647345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129474.

The product of its digits is 10080, while the sum is 29.

The square root of 647345 is about 804.5775288933. The cubic root of 647345 is about 86.5058078005.

The spelling of 647345 in words is "six hundred forty-seven thousand, three hundred forty-five".