1665028 has 6 divisors (see below), whose sum is σ = 2913806. Its totient is φ = 832512.

The previous prime is 1665023. The next prime is 1665029. The reversal of 1665028 is 8205661.

It can be written as a sum of positive squares in only one way, i.e., 1658944 + 6084 = 1288^2 + 78^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1664987 and 1665005.

It is not an unprimeable number, because it can be changed into a prime (1665023) 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 as a sum of consecutive naturals, namely, 208125 + ... + 208132.

2^1665028 is an apocalyptic number.

It is an amenable number.

1665028 is a deficient number, since it is larger than the sum of its proper divisors (1248778).

1665028 is a wasteful number, since it uses less digits than its factorization.

1665028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416261 (or 416259 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1665028 is about 1290.3596397904. The cubic root of 1665028 is about 118.5242403246.

The spelling of 1665028 in words is "one million, six hundred sixty-five thousand, twenty-eight".