647427695904 has 384 divisors, whose sum is σ = 2251551375360. Its totient is φ = 178691788800.

The previous prime is 647427695903. The next prime is 647427695909. The reversal of 647427695904 is 409596724746.

It is a happy number.

647427695904 is a `hidden beast` number, since 6 + 474 + 2 + 76 + 9 + 5 + 90 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (647427695903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4943977 + ... + 5073239.

It is an arithmetic number, because the mean of its divisors is an integer number (5863415040).

Almost surely, 2^647427695904 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 647427695904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1125775687680).

647427695904 is an abundant number, since it is smaller than the sum of its proper divisors (1604123679456).

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

647427695904 is a wasteful number, since it uses less digits than its factorization.

647427695904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129341 (or 129327 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 63.

The spelling of 647427695904 in words is "six hundred forty-seven billion, four hundred twenty-seven million, six hundred ninety-five thousand, nine hundred four".