647478685 has 16 divisors (see below), whose sum is σ = 903024000. Its totient is φ = 436458816.

The previous prime is 647478653. The next prime is 647478697. The reversal of 647478685 is 586874746.

It is a cyclic number.

It is not a de Polignac number, because 647478685 - 2⁵ = 647478653 is a prime.

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, 154710 + ... + 158839.

It is an arithmetic number, because the mean of its divisors is an integer number (56439000).

Almost surely, 2^647478685 is an apocalyptic number.

It is an amenable number.

647478685 is a deficient number, since it is larger than the sum of its proper divisors (255545315).

647478685 is a wasteful number, since it uses less digits than its factorization.

647478685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313620.

The product of its digits is 9031680, while the sum is 55.

The square root of 647478685 is about 25445.6024687961. The cubic root of 647478685 is about 865.1176224159.

The spelling of 647478685 in words is "six hundred forty-seven million, four hundred seventy-eight thousand, six hundred eighty-five".