647663606 has 4 divisors (see below), whose sum is σ = 971495412. Its totient is φ = 323831802.

The previous prime is 647663587. The next prime is 647663663. The reversal of 647663606 is 606366746.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161915900 + ... + 161915903.

It is an arithmetic number, because the mean of its divisors is an integer number (242873853).

Almost surely, 2^647663606 is an apocalyptic number.

647663606 is a deficient number, since it is larger than the sum of its proper divisors (323831806).

647663606 is a wasteful number, since it uses less digits than its factorization.

647663606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323831805.

The product of its (nonzero) digits is 653184, while the sum is 44.

The square root of 647663606 is about 25449.2358627916. The cubic root of 647663606 is about 865.1999742585.

The spelling of 647663606 in words is "six hundred forty-seven million, six hundred sixty-three thousand, six hundred six".