647398285806 has 8 divisors (see below), whose sum is σ = 1294796571624. Its totient is φ = 215799428600.

The previous prime is 647398285771. The next prime is 647398285817. The reversal of 647398285806 is 608582893746.

It is a sphenic number, since it is the product of 3 distinct primes.

647398285806 is an admirable number.

It is a super-2 number, since 2×647398285806² (a number of 24 digits) contains 22 as substring.

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, 53949857145 + ... + 53949857156.

It is an arithmetic number, because the mean of its divisors is an integer number (161849571453).

Almost surely, 2^647398285806 is an apocalyptic number.

647398285806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647398285806 is a wasteful number, since it uses less digits than its factorization.

647398285806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107899714306.

The product of its (nonzero) digits is 139345920, while the sum is 66.

The spelling of 647398285806 in words is "six hundred forty-seven billion, three hundred ninety-eight million, two hundred eighty-five thousand, eight hundred six".