647006667 has 8 divisors (see below), whose sum is σ = 862793424. Its totient is φ = 431278848.

The previous prime is 647006651. The next prime is 647006713. The reversal of 647006667 is 766600746.

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

It is not a de Polignac number, because 647006667 - 2⁴ = 647006651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647006627) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32703 + ... + 48615.

It is an arithmetic number, because the mean of its divisors is an integer number (107849178).

Almost surely, 2^647006667 is an apocalyptic number.

647006667 is a deficient number, since it is larger than the sum of its proper divisors (215786757).

647006667 is a wasteful number, since it uses less digits than its factorization.

647006667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29469.

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 647006667 is about 25436.3257370242. The cubic root of 647006667 is about 864.9073450379.

The spelling of 647006667 in words is "six hundred forty-seven million, six thousand, six hundred sixty-seven".