647983834 has 8 divisors (see below), whose sum is σ = 974285748. Its totient is φ = 323221920.

The previous prime is 647983829. The next prime is 647983837. The reversal of 647983834 is 438389746.

It can be written as a sum of positive squares in 2 ways, for example, as 585494809 + 62489025 = 24197^2 + 7905^2 .

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 (647983837) 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, 383947 + ... + 385630.

Almost surely, 2^647983834 is an apocalyptic number.

647983834 is a deficient number, since it is larger than the sum of its proper divisors (326301914).

647983834 is a wasteful number, since it uses less digits than its factorization.

647983834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770000.

The product of its digits is 3483648, while the sum is 52.

The square root of 647983834 is about 25455.5265905068. The cubic root of 647983834 is about 865.3425460115.

The spelling of 647983834 in words is "six hundred forty-seven million, nine hundred eighty-three thousand, eight hundred thirty-four".