643272425 has 12 divisors (see below), whose sum is σ = 808894656. Its totient is φ = 507368400.

The previous prime is 643272397. The next prime is 643272439. The reversal of 643272425 is 524272346.

It is not a de Polignac number, because 643272425 - 2⁶ = 643272361 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179429 + ... + 182978.

It is an arithmetic number, because the mean of its divisors is an integer number (67407888).

Almost surely, 2^643272425 is an apocalyptic number.

It is an amenable number.

643272425 is a deficient number, since it is larger than the sum of its proper divisors (165622231).

643272425 is a wasteful number, since it uses less digits than its factorization.

643272425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362488 (or 362483 counting only the distinct ones).

The product of its digits is 80640, while the sum is 35.

The square root of 643272425 is about 25362.8157939926. The cubic root of 643272425 is about 863.2401767707.

The spelling of 643272425 in words is "six hundred forty-three million, two hundred seventy-two thousand, four hundred twenty-five".