665734 has 8 divisors (see below), whose sum is σ = 1006848. Its totient is φ = 330120.

The previous prime is 665723. The next prime is 665747. The reversal of 665734 is 437566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 665696 and 665705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057 + ... + 1564.

It is an arithmetic number, because the mean of its divisors is an integer number (125856).

2⁶⁶⁵⁷³⁴ is an apocalyptic number.

665734 is a deficient number, since it is larger than the sum of its proper divisors (341114).

665734 is a wasteful number, since it uses less digits than its factorization.

665734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750.

The product of its digits is 15120, while the sum is 31.

The square root of 665734 is about 815.9252416735. The cubic root of 665734 is about 87.3172894924.

The spelling of 665734 in words is "six hundred sixty-five thousand, seven hundred thirty-four".