647670667 has 16 divisors (see below), whose sum is σ = 747115200. Its totient is φ = 549977472.

The previous prime is 647670637. The next prime is 647670691. The reversal of 647670667 is 766076746.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647670667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647670667.

It is not an unprimeable number, because it can be changed into a prime (647670637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638853 + ... + 639865.

It is an arithmetic number, because the mean of its divisors is an integer number (46694700).

Almost surely, 2^647670667 is an apocalyptic number.

647670667 is a deficient number, since it is larger than the sum of its proper divisors (99444533).

647670667 is a wasteful number, since it uses less digits than its factorization.

647670667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its (nonzero) digits is 1778112, while the sum is 49.

The square root of 647670667 is about 25449.3745895651. The cubic root of 647670667 is about 865.2031184601.

The spelling of 647670667 in words is "six hundred forty-seven million, six hundred seventy thousand, six hundred sixty-seven".