647316736 has 72 divisors (see below), whose sum is σ = 1415461824. Its totient is φ = 293007360.

The previous prime is 647316721. The next prime is 647316749. The reversal of 647316736 is 637613746.

It is a junction number, because it is equal to n+sod(n) for n = 647316692 and 647316701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1286661 + ... + 1287163.

It is an arithmetic number, because the mean of its divisors is an integer number (19659192).

Almost surely, 2^647316736 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 647316736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (707730912).

647316736 is an abundant number, since it is smaller than the sum of its proper divisors (768145088).

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

647316736 is a wasteful number, since it uses less digits than its factorization.

647316736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 973 counting only the distinct ones).

The product of its digits is 381024, while the sum is 43.

The square root of 647316736 is about 25442.4200106829. The cubic root of 647316736 is about 865.0454879350.

The spelling of 647316736 in words is "six hundred forty-seven million, three hundred sixteen thousand, seven hundred thirty-six".