670728 has 16 divisors (see below), whose sum is σ = 1676880. Its totient is φ = 223568.

The previous prime is 670727. The next prime is 670729. The reversal of 670728 is 827076.

It is an interprime number because it is at equal distance from previous prime (670727) and next prime (670729).

It is a super-3 number, since 3×670728³ = 905233389761005056, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 670695 and 670704.

It is not an unprimeable number, because it can be changed into a prime (670727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13950 + ... + 13997.

It is an arithmetic number, because the mean of its divisors is an integer number (104805).

2⁶⁷⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

670728 is an abundant number, since it is smaller than the sum of its proper divisors (1006152).

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

670728 is a wasteful number, since it uses less digits than its factorization.

670728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27956 (or 27952 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 670728 is about 818.9798532321. The cubic root of 670728 is about 87.5350825307.

The spelling of 670728 in words is "six hundred seventy thousand, seven hundred twenty-eight".