647252646 has 8 divisors (see below), whose sum is σ = 1294505304. Its totient is φ = 215750880.

The previous prime is 647252633. The next prime is 647252657. The reversal of 647252646 is 646252746.

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

647252646 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 647252598 and 647252607.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 53937715 + ... + 53937726.

It is an arithmetic number, because the mean of its divisors is an integer number (161813163).

Almost surely, 2^647252646 is an apocalyptic number.

647252646 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.

647252646 is a wasteful number, since it uses less digits than its factorization.

647252646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107875446.

The product of its digits is 483840, while the sum is 42.

The square root of 647252646 is about 25441.1604688151. The cubic root of 647252646 is about 865.0169379779.

The spelling of 647252646 in words is "six hundred forty-seven million, two hundred fifty-two thousand, six hundred forty-six".