660447 has 16 divisors (see below), whose sum is σ = 996960. Its totient is φ = 432000.

The previous prime is 660409. The next prime is 660449. The reversal of 660447 is 744066.

It is not a de Polignac number, because 660447 - 2¹⁰ = 659423 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 660447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1447 + ... + 1847.

It is an arithmetic number, because the mean of its divisors is an integer number (62310).

2⁶⁶⁰⁴⁴⁷ is an apocalyptic number.

660447 is a deficient number, since it is larger than the sum of its proper divisors (336513).

660447 is a wasteful number, since it uses less digits than its factorization.

660447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 660447 is about 812.6789033807. The cubic root of 660447 is about 87.0855282573.

The spelling of 660447 in words is "six hundred sixty thousand, four hundred forty-seven".