647563 has 8 divisors (see below), whose sum is σ = 750080. Its totient is φ = 547560.

The previous prime is 647557. The next prime is 647579. The reversal of 647563 is 365746.

647563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647563 - 2⁵ = 647531 is a prime.

It is a Duffinian number.

647563 is a lucky number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 33 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (93760).

2⁶⁴⁷⁵⁶³ is an apocalyptic number.

647563 is a deficient number, since it is larger than the sum of its proper divisors (102517).

647563 is a wasteful number, since it uses less digits than its factorization.

647563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257.

The product of its digits is 15120, while the sum is 31.

The square root of 647563 is about 804.7129923147. The cubic root of 647563 is about 86.5155172803.

The spelling of 647563 in words is "six hundred forty-seven thousand, five hundred sixty-three".