647490523680 has 864 divisors, whose sum is σ = 3019707407808. Its totient is φ = 124192051200.

The previous prime is 647490523679. The next prime is 647490523681. The reversal of 647490523680 is 86325094746.

647490523680 is a `hidden beast` number, since 6 + 47 + 490 + 5 + 2 + 36 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (647490523679) and next prime (647490523681).

It is not an unprimeable number, because it can be changed into a prime (647490523681) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 10057995 + ... + 10122165.

It is an arithmetic number, because the mean of its divisors is an integer number (3495031722).

Almost surely, 2^647490523680 is an apocalyptic number.

647490523680 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 647490523680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509853703904).

647490523680 is an abundant number, since it is smaller than the sum of its proper divisors (2372216884128).

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

647490523680 is a wasteful number, since it uses less digits than its factorization.

647490523680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64230 (or 64212 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 647490523680 in words is "six hundred forty-seven billion, four hundred ninety million, five hundred twenty-three thousand, six hundred eighty".