647634212 has 6 divisors (see below), whose sum is σ = 1133359878. Its totient is φ = 323817104.

The previous prime is 647634191. The next prime is 647634259. The reversal of 647634212 is 212436746.

It can be written as a sum of positive squares in only one way, i.e., 632220736 + 15413476 = 25144^2 + 3926^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80954273 + ... + 80954280.

It is an arithmetic number, because the mean of its divisors is an integer number (188893313).

Almost surely, 2^647634212 is an apocalyptic number.

It is an amenable number.

647634212 is a deficient number, since it is larger than the sum of its proper divisors (485725666).

647634212 is a wasteful number, since it uses less digits than its factorization.

647634212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161908557 (or 161908555 counting only the distinct ones).

The product of its digits is 48384, while the sum is 35.

The square root of 647634212 is about 25448.6583536343. The cubic root of 647634212 is about 865.1868851216.

The spelling of 647634212 in words is "six hundred forty-seven million, six hundred thirty-four thousand, two hundred twelve".