643826325 has 12 divisors (see below), whose sum is σ = 1064459648. Its totient is φ = 343374000.

The previous prime is 643826317. The next prime is 643826369. The reversal of 643826325 is 523628346.

It is a happy number.

It is not a de Polignac number, because 643826325 - 2³ = 643826317 is a prime.

It is a super-3 number, since 3×643826325³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4292101 + ... + 4292250.

Almost surely, 2^643826325 is an apocalyptic number.

It is an amenable number.

643826325 is a deficient number, since it is larger than the sum of its proper divisors (420633323).

643826325 is a wasteful number, since it uses less digits than its factorization.

643826325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8584364 (or 8584359 counting only the distinct ones).

The product of its digits is 207360, while the sum is 39.

The square root of 643826325 is about 25373.7329732935. The cubic root of 643826325 is about 863.4878746054.

It can be divided in two parts, 64382 and 6325, that added together give a palindrome (70707).

The spelling of 643826325 in words is "six hundred forty-three million, eight hundred twenty-six thousand, three hundred twenty-five".