647288389 has 8 divisors (see below), whose sum is σ = 711214560. Its totient is φ = 584209200.

The previous prime is 647288363. The next prime is 647288429. The reversal of 647288389 is 983882746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647288389 - 2¹⁵ = 647255621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647288309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210142 + ... + 213199.

It is an arithmetic number, because the mean of its divisors is an integer number (88901820).

Almost surely, 2^647288389 is an apocalyptic number.

It is an amenable number.

647288389 is a deficient number, since it is larger than the sum of its proper divisors (63926171).

647288389 is a wasteful number, since it uses less digits than its factorization.

647288389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423491.

The product of its digits is 4644864, while the sum is 55.

The square root of 647288389 is about 25441.8629231430. The cubic root of 647288389 is about 865.0328605245.

The spelling of 647288389 in words is "six hundred forty-seven million, two hundred eighty-eight thousand, three hundred eighty-nine".