647671616 has 56 divisors (see below), whose sum is σ = 1338925440. Its totient is φ = 310464000.

The previous prime is 647671603. The next prime is 647671621. The reversal of 647671616 is 616176746.

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, 279101 + ... + 281411.

Almost surely, 2^647671616 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 647671616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669462720).

647671616 is an abundant number, since it is smaller than the sum of its proper divisors (691253824).

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

647671616 is a wasteful number, since it uses less digits than its factorization.

647671616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503 (or 2493 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 647671616 is about 25449.3932344172. The cubic root of 647671616 is about 865.2035410398.

The spelling of 647671616 in words is "six hundred forty-seven million, six hundred seventy-one thousand, six hundred sixteen".