647068821870 has 32 divisors (see below), whose sum is σ = 1576143762048. Its totient is φ = 169976287008.

The previous prime is 647068821863. The next prime is 647068821881. The reversal of 647068821870 is 78128860746.

It is a happy number.

647068821870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 647068821870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160960384 + ... + 160964403.

It is an arithmetic number, because the mean of its divisors is an integer number (49254492564).

Almost surely, 2^647068821870 is an apocalyptic number.

647068821870 is an abundant number, since it is smaller than the sum of its proper divisors (929074940178).

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

647068821870 is a wasteful number, since it uses less digits than its factorization.

647068821870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321924864.

The product of its (nonzero) digits is 7225344, while the sum is 57.

The spelling of 647068821870 in words is "six hundred forty-seven billion, sixty-eight million, eight hundred twenty-one thousand, eight hundred seventy".