1664275 has 6 divisors (see below), whose sum is σ = 2063732. Its totient is φ = 1331400.

The previous prime is 1664261. The next prime is 1664279. The reversal of 1664275 is 5724661.

It is a happy number.

It is not a de Polignac number, because 1664275 - 2⁹ = 1663763 is a prime.

It is a super-2 number, since 2×1664275² = 5539622551250, which contains 22 as substring.

It is a Duffinian number.

1664275 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1664279) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33261 + ... + 33310.

2^1664275 is an apocalyptic number.

1664275 is a deficient number, since it is larger than the sum of its proper divisors (399457).

1664275 is an equidigital number, since it uses as much as digits as its factorization.

1664275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66581 (or 66576 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 1664275 is about 1290.0678276742. The cubic root of 1664275 is about 118.5063703128.

The spelling of 1664275 in words is "one million, six hundred sixty-four thousand, two hundred seventy-five".