647904852 has 144 divisors (see below), whose sum is σ = 1967293440. Its totient is φ = 183859200.

The previous prime is 647904847. The next prime is 647904893. The reversal of 647904852 is 258409746.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 647904798 and 647904807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1010452 + ... + 1011092.

It is an arithmetic number, because the mean of its divisors is an integer number (13661760).

Almost surely, 2^647904852 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 647904852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983646720).

647904852 is an abundant number, since it is smaller than the sum of its proper divisors (1319388588).

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

647904852 is a wasteful number, since it uses less digits than its factorization.

647904852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 647904852 is about 25453.9751708844. The cubic root of 647904852 is about 865.3073860489.

The spelling of 647904852 in words is "six hundred forty-seven million, nine hundred four thousand, eight hundred fifty-two".