647321285 has 16 divisors (see below), whose sum is σ = 838721520. Its totient is φ = 476774400.

The previous prime is 647321251. The next prime is 647321287. The reversal of 647321285 is 582123746.

It is a happy number.

647321285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 229441 + 647091844 = 479^2 + 25438^2 .

It is not a de Polignac number, because 647321285 - 2²⁴ = 630544069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647321287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12485 + ... + 38085.

It is an arithmetic number, because the mean of its divisors is an integer number (52420095).

Almost surely, 2^647321285 is an apocalyptic number.

647321285 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

647321285 is a deficient number, since it is larger than the sum of its proper divisors (191400235).

647321285 is a wasteful number, since it uses less digits than its factorization.

647321285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26008.

The product of its digits is 80640, while the sum is 38.

The square root of 647321285 is about 25442.5094084683. The cubic root of 647321285 is about 865.0475142911.

The spelling of 647321285 in words is "six hundred forty-seven million, three hundred twenty-one thousand, two hundred eighty-five".