666460 has 24 divisors (see below), whose sum is σ = 1431360. Its totient is φ = 260544.

The previous prime is 666439. The next prime is 666461. The reversal of 666460 is 64666.

666460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666461) 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, 586 + ... + 1294.

It is an arithmetic number, because the mean of its divisors is an integer number (59640).

2⁶⁶⁶⁴⁶⁰ is an apocalyptic number.

It is an amenable number.

666460 is an abundant number, since it is smaller than the sum of its proper divisors (764900).

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

666460 is a wasteful number, since it uses less digits than its factorization.

666460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 666460 is about 816.3700141480. The cubic root of 666460 is about 87.3490185425.

It can be divided in two parts, 6664 and 60, that added together give a square (6724 = 82²).

The spelling of 666460 in words is "six hundred sixty-six thousand, four hundred sixty".