647881662 has 16 divisors (see below), whose sum is σ = 1371984912. Its totient is φ = 203256960.

The previous prime is 647881601. The next prime is 647881667. The reversal of 647881662 is 266188746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647881667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3175789 + ... + 3175992.

It is an arithmetic number, because the mean of its divisors is an integer number (85749057).

Almost surely, 2^647881662 is an apocalyptic number.

647881662 is an abundant number, since it is smaller than the sum of its proper divisors (724103250).

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

647881662 is a wasteful number, since it uses less digits than its factorization.

647881662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6351803.

The product of its digits is 774144, while the sum is 48.

The square root of 647881662 is about 25453.5196387454. The cubic root of 647881662 is about 865.2970621474.

The spelling of 647881662 in words is "six hundred forty-seven million, eight hundred eighty-one thousand, six hundred sixty-two".