665736 has 16 divisors (see below), whose sum is σ = 1664400. Its totient is φ = 221904.

The previous prime is 665723. The next prime is 665747. The reversal of 665736 is 637566.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 665697 and 665706.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665736.

It is an unprimeable number.

665736 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 3 ways as a sum of consecutive naturals, for example, 13846 + ... + 13893.

It is an arithmetic number, because the mean of its divisors is an integer number (104025).

2⁶⁶⁵⁷³⁶ is an apocalyptic number.

It is an amenable number.

665736 is an abundant number, since it is smaller than the sum of its proper divisors (998664).

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

665736 is a wasteful number, since it uses less digits than its factorization.

665736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27748 (or 27744 counting only the distinct ones).

The product of its digits is 22680, while the sum is 33.

The square root of 665736 is about 815.9264672751. The cubic root of 665736 is about 87.3173769319.

The spelling of 665736 in words is "six hundred sixty-five thousand, seven hundred thirty-six".