670128 has 40 divisors (see below), whose sum is σ = 1809408. Its totient is φ = 213312.

The previous prime is 670099. The next prime is 670129. The reversal of 670128 is 821076.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 670098 and 670107.

It is not an unprimeable number, because it can be changed into a prime (670129) by changing a digit.

670128 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 7 ways as a sum of consecutive naturals, for example, 801 + ... + 1407.

2⁶⁷⁰¹²⁸ 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 670128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904704).

670128 is an abundant number, since it is smaller than the sum of its proper divisors (1139280).

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

670128 is a wasteful number, since it uses less digits than its factorization.

670128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 670128 is about 818.6134618976. The cubic root of 670128 is about 87.5089732294.

The spelling of 670128 in words is "six hundred seventy thousand, one hundred twenty-eight".