647616687936 has 112 divisors (see below), whose sum is σ = 1775943290880. Its totient is φ = 208110643200.

The previous prime is 647616687881. The next prime is 647616687937. The reversal of 647616687936 is 639786616746.

647616687936 is digitally balanced in base 2 and base 4, because in such bases 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 (647616687937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356161 + ... + 1192511.

Almost surely, 2^647616687936 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 647616687936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887971645440).

647616687936 is an abundant number, since it is smaller than the sum of its proper divisors (1128326602944).

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

647616687936 is a wasteful number, since it uses less digits than its factorization.

647616687936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836512 (or 836502 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 69.

The spelling of 647616687936 in words is "six hundred forty-seven billion, six hundred sixteen million, six hundred eighty-seven thousand, nine hundred thirty-six".