1664325 has 36 divisors (see below), whose sum is σ = 3215940. Its totient is φ = 817920.

The previous prime is 1664291. The next prime is 1664353. The reversal of 1664325 is 5234661.

1664325 is a `hidden beast` number, since 16 + 643 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 412164 + 1252161 = 642^2 + 1119^2 .

It is not a de Polignac number, because 1664325 - 2⁶ = 1664261 is a prime.

It is a d-powerful number, because it can be written as 1 + 6² + 6⁴ + 4⁸ + 3¹³ + 2³ + 5⁵ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2641 + ... + 3209.

2^1664325 is an apocalyptic number.

1664325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664325 is a deficient number, since it is larger than the sum of its proper divisors (1551615).

1664325 is a wasteful number, since it uses less digits than its factorization.

1664325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 590 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1664325 is about 1290.0872063547. The cubic root of 1664325 is about 118.5075570676.

Adding to 1664325 its reverse (5234661), we get a palindrome (6898986).

The spelling of 1664325 in words is "one million, six hundred sixty-four thousand, three hundred twenty-five".