670840 has 32 divisors (see below), whose sum is σ = 1560960. Its totient is φ = 259200.

The previous prime is 670823. The next prime is 670849. The reversal of 670840 is 48076.

670840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670849) 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, 970 + ... + 1510.

It is an arithmetic number, because the mean of its divisors is an integer number (48780).

2⁶⁷⁰⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 670840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (780480).

670840 is an abundant number, since it is smaller than the sum of its proper divisors (890120).

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

670840 is a wasteful number, since it uses less digits than its factorization.

670840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 670840 is about 819.0482281282. The cubic root of 670840 is about 87.5399545422.

The spelling of 670840 in words is "six hundred seventy thousand, eight hundred forty".