670720 has 44 divisors (see below), whose sum is σ = 1621224. Its totient is φ = 266240.

The previous prime is 670711. The next prime is 670727. The reversal of 670720 is 27076.

It is a junction number, because it is equal to n+sod(n) for n = 670691 and 670700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670727) 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, 5055 + ... + 5185.

It is an arithmetic number, because the mean of its divisors is an integer number (36846).

2⁶⁷⁰⁷²⁰ 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 670720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810612).

670720 is an abundant number, since it is smaller than the sum of its proper divisors (950504).

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

670720 is a wasteful number, since it uses less digits than its factorization.

670720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 670720 is about 818.9749690925. The cubic root of 670720 is about 87.5347345091.

Adding to 670720 its reverse (27076), we get a palindrome (697796).

The spelling of 670720 in words is "six hundred seventy thousand, seven hundred twenty".