663726 has 16 divisors (see below), whose sum is σ = 1517184. Its totient is φ = 189624.

The previous prime is 663713. The next prime is 663737. The reversal of 663726 is 627366.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 663693 and 663702.

It is a congruent number.

It is an unprimeable number.

663726 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7860 + ... + 7943.

It is an arithmetic number, because the mean of its divisors is an integer number (94824).

2⁶⁶³⁷²⁶ is an apocalyptic number.

663726 is an abundant number, since it is smaller than the sum of its proper divisors (853458).

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

663726 is a wasteful number, since it uses less digits than its factorization.

663726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15815.

The product of its digits is 9072, while the sum is 30.

The square root of 663726 is about 814.6938075130. The cubic root of 663726 is about 87.2294117042.

The spelling of 663726 in words is "six hundred sixty-three thousand, seven hundred twenty-six".