6480520740 has 144 divisors (see below), whose sum is σ = 20360471040. Its totient is φ = 1667393280.

The previous prime is 6480520723. The next prime is 6480520763. The reversal of 6480520740 is 470250846.

6480520740 is a `hidden beast` number, since 64 + 8 + 0 + 520 + 74 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6480520695 and 6480520704.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 595266 + ... + 606054.

It is an arithmetic number, because the mean of its divisors is an integer number (141392160).

Almost surely, 2^6480520740 is an apocalyptic number.

6480520740 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 6480520740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10180235520).

6480520740 is an abundant number, since it is smaller than the sum of its proper divisors (13879950300).

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

6480520740 is a wasteful number, since it uses less digits than its factorization.

6480520740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10922 (or 10917 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 6480520740 is about 80501.6815973430. The cubic root of 6480520740 is about 1864.3894423660.

The spelling of 6480520740 in words is "six billion, four hundred eighty million, five hundred twenty thousand, seven hundred forty".