670865 has 8 divisors (see below), whose sum is σ = 867048. Its totient is φ = 495360.

The previous prime is 670853. The next prime is 670867. The reversal of 670865 is 568076.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 654481 = 128^2 + 809^2 .

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

It is not a de Polignac number, because 670865 - 2⁴ = 670849 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670867) 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, 5096 + ... + 5225.

It is an arithmetic number, because the mean of its divisors is an integer number (108381).

2⁶⁷⁰⁸⁶⁵ is an apocalyptic number.

670865 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

670865 is a deficient number, since it is larger than the sum of its proper divisors (196183).

670865 is a wasteful number, since it uses less digits than its factorization.

670865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10339.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 670865 is about 819.0634896026. The cubic root of 670865 is about 87.5410419707.

The spelling of 670865 in words is "six hundred seventy thousand, eight hundred sixty-five".