673785 has 64 divisors (see below), whose sum is σ = 1474560. Its totient is φ = 285120.

The previous prime is 673781. The next prime is 673787. The reversal of 673785 is 587376.

It is not a de Polignac number, because 673785 - 2² = 673781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673781) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21720 + ... + 21750.

It is an arithmetic number, because the mean of its divisors is an integer number (23040).

2⁶⁷³⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

673785 is an abundant number, since it is smaller than the sum of its proper divisors (800775).

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

673785 is a wasteful number, since it uses less digits than its factorization.

673785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 69 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 673785 is about 820.8440777639. The cubic root of 673785 is about 87.6678682161.

The spelling of 673785 in words is "six hundred seventy-three thousand, seven hundred eighty-five".