663534 has 24 divisors (see below), whose sum is σ = 1452672. Its totient is φ = 218880.

The previous prime is 663529. The next prime is 663539. The reversal of 663534 is 435366.

It is an interprime number because it is at equal distance from previous prime (663529) and next prime (663539).

It is a junction number, because it is equal to n+sod(n) for n = 663498 and 663507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3342 + ... + 3534.

It is an arithmetic number, because the mean of its divisors is an integer number (60528).

663534 is a Friedman number, since it can be written as (6^3*4^5-6)*3, using all its digits and the basic arithmetic operations.

2⁶⁶³⁵³⁴ is an apocalyptic number.

663534 is an abundant number, since it is smaller than the sum of its proper divisors (789138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663534 is a wasteful number, since it uses less digits than its factorization.

663534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 389 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 663534 is about 814.5759633085. The cubic root of 663534 is about 87.2209997680.

It can be divided in two parts, 66 and 3534, that added together give a square (3600 = 60²).

The spelling of 663534 in words is "six hundred sixty-three thousand, five hundred thirty-four".