665722 has 8 divisors (see below), whose sum is σ = 1051200. Its totient is φ = 315324.

The previous prime is 665719. The next prime is 665723. The reversal of 665722 is 227566.

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (665723) 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, 8722 + ... + 8797.

It is an arithmetic number, because the mean of its divisors is an integer number (131400).

2⁶⁶⁵⁷²² is an apocalyptic number.

665722 is a deficient number, since it is larger than the sum of its proper divisors (385478).

665722 is a wasteful number, since it uses less digits than its factorization.

665722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17540.

The product of its digits is 5040, while the sum is 28.

The square root of 665722 is about 815.9178880255. The cubic root of 665722 is about 87.3167648515.

The spelling of 665722 in words is "six hundred sixty-five thousand, seven hundred twenty-two".