647642705 has 8 divisors (see below), whose sum is σ = 790344000. Its totient is φ = 509332336.

The previous prime is 647642689. The next prime is 647642771. The reversal of 647642705 is 507246746.

647642705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 647642705 - 2⁴ = 647642689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097405 + ... + 1097994.

It is an arithmetic number, because the mean of its divisors is an integer number (98793000).

Almost surely, 2^647642705 is an apocalyptic number.

It is an amenable number.

647642705 is a deficient number, since it is larger than the sum of its proper divisors (142701295).

647642705 is a wasteful number, since it uses less digits than its factorization.

647642705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195463.

The product of its (nonzero) digits is 282240, while the sum is 41.

The square root of 647642705 is about 25448.8252184654. The cubic root of 647642705 is about 865.1906670919.

The spelling of 647642705 in words is "six hundred forty-seven million, six hundred forty-two thousand, seven hundred five".