647481816380 has 144 divisors (see below), whose sum is σ = 1619319794400. Its totient is φ = 216719903232.

The previous prime is 647481816299. The next prime is 647481816389. The reversal of 647481816380 is 83618184746.

It is a happy number.

647481816380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647481816389) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148878446 + ... + 148882794.

It is an arithmetic number, because the mean of its divisors is an integer number (11245276350).

Almost surely, 2^647481816380 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 647481816380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809659897200).

647481816380 is an abundant number, since it is smaller than the sum of its proper divisors (971837978020).

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

647481816380 is a wasteful number, since it uses less digits than its factorization.

647481816380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948 (or 7939 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 647481816380 in words is "six hundred forty-seven billion, four hundred eighty-one million, eight hundred sixteen thousand, three hundred eighty".