647575 has 6 divisors (see below), whose sum is σ = 803024. Its totient is φ = 518040.

The previous prime is 647557. The next prime is 647579. The reversal of 647575 is 575746.

It is not a de Polignac number, because 647575 - 2¹¹ = 645527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647575.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647579) 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 5 ways as a sum of consecutive naturals, for example, 12927 + ... + 12976.

2⁶⁴⁷⁵⁷⁵ is an apocalyptic number.

647575 is a deficient number, since it is larger than the sum of its proper divisors (155449).

647575 is a wasteful number, since it uses less digits than its factorization.

647575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25913 (or 25908 counting only the distinct ones).

The product of its digits is 29400, while the sum is 34.

The square root of 647575 is about 804.7204483546. The cubic root of 647575 is about 86.5160516838.

The spelling of 647575 in words is "six hundred forty-seven thousand, five hundred seventy-five".