666736 has 20 divisors (see below), whose sum is σ = 1476592. Its totient is φ = 285696.

The previous prime is 666733. The next prime is 666737. The reversal of 666736 is 637666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2865 + ... + 3088.

2⁶⁶⁶⁷³⁶ is an apocalyptic number.

It is an amenable number.

666736 is an abundant number, since it is smaller than the sum of its proper divisors (809856).

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

666736 is a wasteful number, since it uses less digits than its factorization.

666736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5968 (or 5962 counting only the distinct ones).

The product of its digits is 27216, while the sum is 34.

The square root of 666736 is about 816.5390376461. The cubic root of 666736 is about 87.3610747809.

The spelling of 666736 in words is "six hundred sixty-six thousand, seven hundred thirty-six".