665270 has 16 divisors (see below), whose sum is σ = 1215648. Its totient is φ = 262080.

The previous prime is 665267. The next prime is 665279. The reversal of 665270 is 72566.

665270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242 + ... + 1178.

It is an arithmetic number, because the mean of its divisors is an integer number (75978).

2⁶⁶⁵²⁷⁰ is an apocalyptic number.

665270 is a deficient number, since it is larger than the sum of its proper divisors (550378).

665270 is a wasteful number, since it uses less digits than its factorization.

665270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 665270 is about 815.6408523364. The cubic root of 665270 is about 87.2969987863.

Subtracting from 665270 its reverse (72566), we obtain a cube (592704 = 84³).

The spelling of 665270 in words is "six hundred sixty-five thousand, two hundred seventy".