670440 has 64 divisors (see below), whose sum is σ = 2079360. Its totient is φ = 172800.

The previous prime is 670409. The next prime is 670447. The reversal of 670440 is 44076.

670440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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

670440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4365 + ... + 4515.

It is an arithmetic number, because the mean of its divisors is an integer number (32490).

2⁶⁷⁰⁴⁴⁰ is an apocalyptic number.

670440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 670440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039680).

670440 is an abundant number, since it is smaller than the sum of its proper divisors (1408920).

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

670440 is a wasteful number, since it uses less digits than its factorization.

670440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 670440 is about 818.8040058524. The cubic root of 670440 is about 87.5225520101.

The spelling of 670440 in words is "six hundred seventy thousand, four hundred forty".