647745696 has 144 divisors (see below), whose sum is σ = 2100617064. Its totient is φ = 187564032.

The previous prime is 647745691. The next prime is 647745737. The reversal of 647745696 is 696547746.

647745696 is a `hidden beast` number, since 6 + 4 + 7 + 74 + 569 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 567392400 + 80353296 = 23820^2 + 8964^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (647745691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58560 + ... + 68736.

Almost surely, 2^647745696 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 647745696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050308532).

647745696 is an abundant number, since it is smaller than the sum of its proper divisors (1452871368).

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

647745696 is a wasteful number, since it uses less digits than its factorization.

647745696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10223 (or 10212 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The square root of 647745696 is about 25450.8486302520. The cubic root of 647745696 is about 865.2365268066.

The spelling of 647745696 in words is "six hundred forty-seven million, seven hundred forty-five thousand, six hundred ninety-six".