660450 has 96 divisors (see below), whose sum is σ = 2035584. Its totient is φ = 138240.

The previous prime is 660449. The next prime is 660493. The reversal of 660450 is 54066.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17832 + ... + 17868.

It is an arithmetic number, because the mean of its divisors is an integer number (21204).

2⁶⁶⁰⁴⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017792).

660450 is an abundant number, since it is smaller than the sum of its proper divisors (1375134).

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

660450 is a wasteful number, since it uses less digits than its factorization.

660450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 660450 is about 812.6807491260. The cubic root of 660450 is about 87.0856601155.

The spelling of 660450 in words is "six hundred sixty thousand, four hundred fifty".