660636 has 30 divisors (see below), whose sum is σ = 1727880. Its totient is φ = 220104.

The previous prime is 660619. The next prime is 660643. The reversal of 660636 is 636066.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660636.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 696 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (57596).

2⁶⁶⁰⁶³⁶ is an apocalyptic number.

It is an amenable number.

660636 is an abundant number, since it is smaller than the sum of its proper divisors (1067244).

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

660636 is a wasteful number, since it uses less digits than its factorization.

660636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055 (or 2044 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 660636 is about 812.7951771510. The cubic root of 660636 is about 87.0938345483.

It can be divided in two parts, 660 and 636, that added together give a 4-th power (1296 = 6⁴).

The spelling of 660636 in words is "six hundred sixty thousand, six hundred thirty-six".