647523 has 6 divisors (see below), whose sum is σ = 935324. Its totient is φ = 431676.

The previous prime is 647509. The next prime is 647527. The reversal of 647523 is 325746.

It is a happy number.

647523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647523 - 2⁹ = 647011 is a prime.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 35965 + ... + 35982.

2⁶⁴⁷⁵²³ is an apocalyptic number.

647523 is a deficient number, since it is larger than the sum of its proper divisors (287801).

647523 is a wasteful number, since it uses less digits than its factorization.

647523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71953 (or 71950 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 647523 is about 804.6881383493. The cubic root of 647523 is about 86.5137358877.

The spelling of 647523 in words is "six hundred forty-seven thousand, five hundred twenty-three".