647935 has 4 divisors (see below), whose sum is σ = 777528. Its totient is φ = 518344.

The previous prime is 647917. The next prime is 647951. The reversal of 647935 is 539746.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647935 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647935.

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, 64789 + ... + 64798.

It is an arithmetic number, because the mean of its divisors is an integer number (194382).

2⁶⁴⁷⁹³⁵ is an apocalyptic number.

647935 is a deficient number, since it is larger than the sum of its proper divisors (129593).

647935 is a wasteful number, since it uses less digits than its factorization.

647935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129592.

The product of its digits is 22680, while the sum is 34.

The square root of 647935 is about 804.9440974378. The cubic root of 647935 is about 86.5320807198.

The spelling of 647935 in words is "six hundred forty-seven thousand, nine hundred thirty-five".