670445 has 4 divisors (see below), whose sum is σ = 804540. Its totient is φ = 536352.

The previous prime is 670409. The next prime is 670447. The reversal of 670445 is 544076.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 244036 = 653^2 + 494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670445 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67040 + ... + 67049.

It is an arithmetic number, because the mean of its divisors is an integer number (201135).

2⁶⁷⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

670445 is a deficient number, since it is larger than the sum of its proper divisors (134095).

670445 is a wasteful number, since it uses less digits than its factorization.

670445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134094.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 670445 is about 818.8070590805. The cubic root of 670445 is about 87.5227695845.

The spelling of 670445 in words is "six hundred seventy thousand, four hundred forty-five".