665470 has 16 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 245664.

The previous prime is 665447. The next prime is 665479. The reversal of 665470 is 74566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665479) 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, 2430 + ... + 2689.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2⁶⁶⁵⁴⁷⁰ is an apocalyptic number.

665470 is a deficient number, since it is larger than the sum of its proper divisors (624770).

665470 is a wasteful number, since it uses less digits than its factorization.

665470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5139.

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

The square root of 665470 is about 815.7634461043. The cubic root of 665470 is about 87.3057459368.

It can be divided in two parts, 6654 and 70, that added together give a square (6724 = 82²).

The spelling of 665470 in words is "six hundred sixty-five thousand, four hundred seventy".