647505 has 12 divisors (see below), whose sum is σ = 1122420. Its totient is φ = 345312.

The previous prime is 647503. The next prime is 647509. The reversal of 647505 is 505746.

It can be written as a sum of positive squares in 2 ways, for example, as 207936 + 439569 = 456^2 + 663^2 .

It is not a de Polignac number, because 647505 - 2¹ = 647503 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647505.

It is not an unprimeable number, because it can be changed into a prime (647503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7150 + ... + 7239.

It is an arithmetic number, because the mean of its divisors is an integer number (93535).

2⁶⁴⁷⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

647505 is a deficient number, since it is larger than the sum of its proper divisors (474915).

647505 is a wasteful number, since it uses less digits than its factorization.

647505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14400 (or 14397 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 647505 is about 804.6769538144. The cubic root of 647505 is about 86.5129342370.

It can be divided in two parts, 64 and 7505, that added together give a square (7569 = 87²).

The spelling of 647505 in words is "six hundred forty-seven thousand, five hundred five".