660432 has 20 divisors (see below), whose sum is σ = 1706240. Its totient is φ = 220128.

The previous prime is 660409. The next prime is 660449. The reversal of 660432 is 234066.

It is a junction number, because it is equal to n+sod(n) for n = 660399 and 660408.

It is a congruent number.

It is an unprimeable number.

660432 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6832 + ... + 6927.

It is an arithmetic number, because the mean of its divisors is an integer number (85312).

2⁶⁶⁰⁴³² is an apocalyptic number.

It is an amenable number.

660432 is an abundant number, since it is smaller than the sum of its proper divisors (1045808).

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

660432 is a wasteful number, since it uses less digits than its factorization.

660432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13770 (or 13764 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 660432 is about 812.6696745911. The cubic root of 660432 is about 87.0848689599.

Adding to 660432 its reverse (234066), we get a palindrome (894498).

The spelling of 660432 in words is "six hundred sixty thousand, four hundred thirty-two".