679785 has 8 divisors (see below), whose sum is σ = 1087680. Its totient is φ = 362544.

The previous prime is 679781. The next prime is 679793. The reversal of 679785 is 587976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 679785 - 2² = 679781 is a prime.

It is a Curzon number.

679785 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22645 + ... + 22674.

It is an arithmetic number, because the mean of its divisors is an integer number (135960).

2⁶⁷⁹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

679785 is a deficient number, since it is larger than the sum of its proper divisors (407895).

679785 is a wasteful number, since it uses less digits than its factorization.

679785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45327.

The product of its digits is 105840, while the sum is 42.

The square root of 679785 is about 824.4907519190. The cubic root of 679785 is about 87.9273246390.

Subtracting from 679785 its reverse (587976), we obtain a square (91809 = 303²).

The spelling of 679785 in words is "six hundred seventy-nine thousand, seven hundred eighty-five".