660538 has 8 divisors (see below), whose sum is σ = 1012032. Its totient is φ = 323196.

The previous prime is 660529. The next prime is 660547. The reversal of 660538 is 835066.

It is an interprime number because it is at equal distance from previous prime (660529) and next prime (660547).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3420 + ... + 3607.

It is an arithmetic number, because the mean of its divisors is an integer number (126504).

2⁶⁶⁰⁵³⁸ is an apocalyptic number.

660538 is a deficient number, since it is larger than the sum of its proper divisors (351494).

660538 is a wasteful number, since it uses less digits than its factorization.

660538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7076.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 660538 is about 812.7348891244. The cubic root of 660538 is about 87.0895277804.

The spelling of 660538 in words is "six hundred sixty thousand, five hundred thirty-eight".