663723 has 12 divisors (see below), whose sum is σ = 992160. Its totient is φ = 427056.

The previous prime is 663713. The next prime is 663737. The reversal of 663723 is 327366.

663723 is a `hidden beast` number, since 6 + 637 + 23 = 666.

It is not a de Polignac number, because 663723 - 2⁶ = 663659 is a prime.

It is a d-powerful number, because it can be written as 6³ + 6³ + 7² + 3⁶ + 2¹⁷ + 3¹² .

It is not an unprimeable number, because it can be changed into a prime (663713) 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, 1011 + ... + 1532.

It is an arithmetic number, because the mean of its divisors is an integer number (82680).

2⁶⁶³⁷²³ is an apocalyptic number.

663723 is a deficient number, since it is larger than the sum of its proper divisors (328437).

663723 is a wasteful number, since it uses less digits than its factorization.

663723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578 (or 2575 counting only the distinct ones).

The product of its digits is 4536, while the sum is 27.

The square root of 663723 is about 814.6919663284. The cubic root of 663723 is about 87.2292802801.

The spelling of 663723 in words is "six hundred sixty-three thousand, seven hundred twenty-three".