647038438834 has 8 divisors (see below), whose sum is σ = 983852968860. Its totient is φ = 319087449216.

The previous prime is 647038438831. The next prime is 647038438847. The reversal of 647038438834 is 438834830746.

It can be written as a sum of positive squares in 2 ways, for example, as 574298730625 + 72739708209 = 757825^2 + 269703^2 .

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

It is not an unprimeable number, because it can be changed into a prime (647038438831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2215884919 + ... + 2215885210.

Almost surely, 2^647038438834 is an apocalyptic number.

647038438834 is a deficient number, since it is larger than the sum of its proper divisors (336814530026).

647038438834 is a wasteful number, since it uses less digits than its factorization.

647038438834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431770204.

The product of its (nonzero) digits is 37158912, while the sum is 58.

The spelling of 647038438834 in words is "six hundred forty-seven billion, thirty-eight million, four hundred thirty-eight thousand, eight hundred thirty-four".