647885 has 16 divisors (see below), whose sum is σ = 902016. Its totient is φ = 437568.

The previous prime is 647861. The next prime is 647891. The reversal of 647885 is 588746.

It is a cyclic number.

It is not a de Polignac number, because 647885 - 2⁶ = 647821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647885.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3659 + ... + 3831.

It is an arithmetic number, because the mean of its divisors is an integer number (56376).

2⁶⁴⁷⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

647885 is a deficient number, since it is larger than the sum of its proper divisors (254131).

647885 is a wasteful number, since it uses less digits than its factorization.

647885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 53760, while the sum is 38.

The square root of 647885 is about 804.9130387812. The cubic root of 647885 is about 86.5298548199.

The spelling of 647885 in words is "six hundred forty-seven thousand, eight hundred eighty-five".