647193568 has 72 divisors (see below), whose sum is σ = 1490638464. Its totient is φ = 275788800.

The previous prime is 647193511. The next prime is 647193581. The reversal of 647193568 is 865391746.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 298408 + ... + 300568.

It is an arithmetic number, because the mean of its divisors is an integer number (20703312).

Almost surely, 2^647193568 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 647193568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745319232).

647193568 is an abundant number, since it is smaller than the sum of its proper divisors (843444896).

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

647193568 is a wasteful number, since it uses less digits than its factorization.

647193568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376 (or 2361 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The square root of 647193568 is about 25439.9993710692. Note that the first 3 decimals coincide. The cubic root of 647193568 is about 864.9906190302.

The spelling of 647193568 in words is "six hundred forty-seven million, one hundred ninety-three thousand, five hundred sixty-eight".