660629 has 4 divisors (see below), whose sum is σ = 689376. Its totient is φ = 631884.

The previous prime is 660619. The next prime is 660643. The reversal of 660629 is 926066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 926066 = 2 ⋅463033.

It is a cyclic number.

It is not a de Polignac number, because 660629 - 2¹⁶ = 595093 is a prime.

It is a Duffinian 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 (660619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14339 + ... + 14384.

It is an arithmetic number, because the mean of its divisors is an integer number (172344).

2⁶⁶⁰⁶²⁹ is an apocalyptic number.

It is an amenable number.

660629 is a deficient number, since it is larger than the sum of its proper divisors (28747).

660629 is a wasteful number, since it uses less digits than its factorization.

660629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28746.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 660629 is about 812.7908710117. The cubic root of 660629 is about 87.0935269362.

The spelling of 660629 in words is "six hundred sixty thousand, six hundred twenty-nine".