647534 has 4 divisors (see below), whose sum is σ = 971304. Its totient is φ = 323766.

The previous prime is 647531. The next prime is 647551. The reversal of 647534 is 435746.

647534 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 647497 and 647506.

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 647534.

It is not an unprimeable number, because it can be changed into a prime (647531) 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 as a sum of consecutive naturals, namely, 161882 + ... + 161885.

It is an arithmetic number, because the mean of its divisors is an integer number (242826).

2⁶⁴⁷⁵³⁴ is an apocalyptic number.

647534 is a deficient number, since it is larger than the sum of its proper divisors (323770).

647534 is a wasteful number, since it uses less digits than its factorization.

647534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323769.

The product of its digits is 10080, while the sum is 29.

The square root of 647534 is about 804.6949732663. The cubic root of 647534 is about 86.5142257780.

The spelling of 647534 in words is "six hundred forty-seven thousand, five hundred thirty-four".