647996285 has 16 divisors (see below), whose sum is σ = 809139456. Its totient is φ = 497784768.

The previous prime is 647996269. The next prime is 647996303. The reversal of 647996285 is 582699746.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 647996285 - 2⁴ = 647996269 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 647996285.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13559 + ... + 38468.

It is an arithmetic number, because the mean of its divisors is an integer number (50571216).

Almost surely, 2^647996285 is an apocalyptic number.

It is an amenable number.

647996285 is a deficient number, since it is larger than the sum of its proper divisors (161143171).

647996285 is a wasteful number, since it uses less digits than its factorization.

647996285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52132.

The product of its digits is 6531840, while the sum is 56.

The square root of 647996285 is about 25455.7711531197. The cubic root of 647996285 is about 865.3480884908.

The spelling of 647996285 in words is "six hundred forty-seven million, nine hundred ninety-six thousand, two hundred eighty-five".