647803668 has 24 divisors (see below), whose sum is σ = 1526219968. Its totient is φ = 213837696.

The previous prime is 647803661. The next prime is 647803669. The reversal of 647803668 is 866308746.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647803661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260821 + ... + 263292.

Almost surely, 2^647803668 is an apocalyptic number.

It is an amenable number.

647803668 is an abundant number, since it is smaller than the sum of its proper divisors (878416300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647803668 is a wasteful number, since it uses less digits than its factorization.

647803668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524223 (or 524221 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 647803668 is about 25451.9875058904. The cubic root of 647803668 is about 865.2623383743.

The spelling of 647803668 in words is "six hundred forty-seven million, eight hundred three thousand, six hundred sixty-eight".