647845822640 has 80 divisors (see below), whose sum is σ = 1654453036800. Its totient is φ = 234825566976.

The previous prime is 647845822577. The next prime is 647845822711. The reversal of 647845822640 is 46228548746.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9230570 + ... + 9300489.

It is an arithmetic number, because the mean of its divisors is an integer number (20680662960).

Almost surely, 2^647845822640 is an apocalyptic number.

It is an amenable number.

647845822640 is an abundant number, since it is smaller than the sum of its proper divisors (1006607214160).

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

647845822640 is a wasteful number, since it uses less digits than its factorization.

647845822640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18531114 (or 18531108 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 56.

The spelling of 647845822640 in words is "six hundred forty-seven billion, eight hundred forty-five million, eight hundred twenty-two thousand, six hundred forty".