647373681240 has 512 divisors, whose sum is σ = 2332650700800. Its totient is φ = 141664573440.

The previous prime is 647373681211. The next prime is 647373681271. The reversal of 647373681240 is 42186373746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 145051249 + ... + 145055711.

It is an arithmetic number, because the mean of its divisors is an integer number (4555958400).

Almost surely, 2^647373681240 is an apocalyptic number.

647373681240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647373681240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166325350400).

647373681240 is an abundant number, since it is smaller than the sum of its proper divisors (1685277019560).

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

647373681240 is a wasteful number, since it uses less digits than its factorization.

647373681240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687 (or 4683 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 51.

The spelling of 647373681240 in words is "six hundred forty-seven billion, three hundred seventy-three million, six hundred eighty-one thousand, two hundred forty".