1670728 has 16 divisors (see below), whose sum is σ = 3166380. Its totient is φ = 826368.

The previous prime is 1670723. The next prime is 1670741. The reversal of 1670728 is 8270761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1542564 + 128164 = 1242^2 + 358^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1670728.

It is not an unprimeable number, because it can be changed into a prime (1670723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301 + ... + 1852.

2^1670728 is an apocalyptic number.

It is an amenable number.

1670728 is a deficient number, since it is larger than the sum of its proper divisors (1495652).

1670728 is a wasteful number, since it uses less digits than its factorization.

1670728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256 (or 2252 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 1670728 is about 1292.5664392982. The cubic root of 1670728 is about 118.6593368924.

The spelling of 1670728 in words is "one million, six hundred seventy thousand, seven hundred twenty-eight".