670145 has 16 divisors (see below), whose sum is σ = 943488. Its totient is φ = 447360.

The previous prime is 670139. The next prime is 670147. The reversal of 670145 is 541076.

It is not a de Polignac number, because 670145 - 2⁴ = 670129 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 670145.

It is not an unprimeable number, because it can be changed into a prime (670147) 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, 1202 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (58968).

2⁶⁷⁰¹⁴⁵ is an apocalyptic number.

It is an amenable number.

670145 is a deficient number, since it is larger than the sum of its proper divisors (273343).

670145 is a wasteful number, since it uses less digits than its factorization.

670145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 670145 is about 818.6238452427. The cubic root of 670145 is about 87.5097132074.

The spelling of 670145 in words is "six hundred seventy thousand, one hundred forty-five".