647820301840 has 160 divisors (see below), whose sum is σ = 1664552033280. Its totient is φ = 233373685248.

The previous prime is 647820301837. The next prime is 647820301841. The reversal of 647820301840 is 48103028746.

It is a super-2 number, since 2×647820301840² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647820301841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5641639 + ... + 5755321.

It is an arithmetic number, because the mean of its divisors is an integer number (10403450208).

Almost surely, 2^647820301840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647820301840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (832276016640).

647820301840 is an abundant number, since it is smaller than the sum of its proper divisors (1016731731440).

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

647820301840 is a wasteful number, since it uses less digits than its factorization.

647820301840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113901 (or 113895 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 647820301840 in words is "six hundred forty-seven billion, eight hundred twenty million, three hundred one thousand, eight hundred forty".