647123473 has 8 divisors (see below), whose sum is σ = 652952520. Its totient is φ = 641310720.

The previous prime is 647123461. The next prime is 647123501. The reversal of 647123473 is 374321746.

It can be written as a sum of positive squares in 4 ways, for example, as 411562369 + 235561104 = 20287^2 + 15348^2 .

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 647123473 - 2⁹ = 647122961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647123273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84133 + ... + 91501.

It is an arithmetic number, because the mean of its divisors is an integer number (81619065).

Almost surely, 2^647123473 is an apocalyptic number.

It is an amenable number.

647123473 is a deficient number, since it is larger than the sum of its proper divisors (5829047).

647123473 is a wasteful number, since it uses less digits than its factorization.

647123473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8147.

The product of its digits is 84672, while the sum is 37.

The square root of 647123473 is about 25438.6216804292. The cubic root of 647123473 is about 864.9593899876.

The spelling of 647123473 in words is "six hundred forty-seven million, one hundred twenty-three thousand, four hundred seventy-three".