660634 has 8 divisors (see below), whose sum is σ = 1067220. Its totient is φ = 304896.

The previous prime is 660619. The next prime is 660643. The reversal of 660634 is 436066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 540225 + 120409 = 735^2 + 347^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 660599 and 660608.

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, 12679 + ... + 12730.

2⁶⁶⁰⁶³⁴ is an apocalyptic number.

660634 is a deficient number, since it is larger than the sum of its proper divisors (406586).

660634 is a wasteful number, since it uses less digits than its factorization.

660634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25424.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 660634 is about 812.7939468279. The cubic root of 660634 is about 87.0937466594.

The spelling of 660634 in words is "six hundred sixty thousand, six hundred thirty-four".