660490 has 12 divisors (see below), whose sum is σ = 1193526. Its totient is φ = 263168.

The previous prime is 660449. The next prime is 660493. The reversal of 660490 is 94066.

It can be written as a sum of positive squares in 3 ways, for example, as 635209 + 25281 = 797^2 + 159^2 .

It is not an unprimeable number, because it can be changed into a prime (660493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2442 + ... + 2698.

2⁶⁶⁰⁴⁹⁰ is an apocalyptic number.

660490 is a deficient number, since it is larger than the sum of its proper divisors (533036).

660490 is an equidigital number, since it uses as much as digits as its factorization.

660490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 660490 is about 812.7053586633. The cubic root of 660490 is about 87.0874181876.

The spelling of 660490 in words is "six hundred sixty thousand, four hundred ninety".