670340 has 36 divisors (see below), whose sum is σ = 1552908. Its totient is φ = 242880.

The previous prime is 670333. The next prime is 670343. The reversal of 670340 is 43076.

670340 = 40² + 41² + ... + 127².

It can be written as a sum of positive squares in 2 ways, for example, as 174724 + 495616 = 418^2 + 704^2 .

It is a super-3 number, since 3×670340³ = 903663331185912000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (670343) by changing a digit.

670340 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 11 ways as a sum of consecutive naturals, for example, 2282 + ... + 2558.

2⁶⁷⁰³⁴⁰ 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 670340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776454).

670340 is an abundant number, since it is smaller than the sum of its proper divisors (882568).

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

670340 is a wasteful number, since it uses less digits than its factorization.

670340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 670340 is about 818.7429389008. The cubic root of 670340 is about 87.5182002956.

Subtracting from 670340 its reverse (43076), we obtain a square (627264 = 792²).

The spelling of 670340 in words is "six hundred seventy thousand, three hundred forty".