647522 has 6 divisors (see below), whose sum is σ = 972993.
Its totient is φ = 323192.
The previous prime is 647509. The next prime is 647527. The reversal of 647522 is 225746.
It can be written as a sum of positive squares in 2 ways, for example, as 564001 + 83521 = 751^2 + 289^2
It is an ABA number since it can be written as A⋅BA, here for A=2, B=569.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 647491 and 647500.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647522.
It is not an unprimeable number, because it can be changed into a prime (647527) by changing a digit.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 854 + ... + 1422.
2647522 is an apocalyptic number.
647522 is a deficient number, since it is larger than the sum of its proper divisors (325471).
647522 is an frugal number, since it uses more digits than its factorization.
647522 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1140 (or 571 counting only the distinct ones).
The product of its digits is 3360, while the sum is 26.
The square root of 647522 is about 804.6875169903.
The cubic root of 647522 is about 86.5136913519.
The spelling of 647522 in words is "six hundred forty-seven thousand, five hundred twenty-two".