643625 has 16 divisors (see below), whose sum is σ = 848640. Its totient is φ = 486000.

The previous prime is 643619. The next prime is 643633. The reversal of 643625 is 526346.

It is not a de Polignac number, because 643625 - 2⁸ = 643369 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 643594 and 643603.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643625.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2240 + ... + 2510.

It is an arithmetic number, because the mean of its divisors is an integer number (53040).

2⁶⁴³⁶²⁵ is an apocalyptic number.

It is an amenable number.

643625 is a deficient number, since it is larger than the sum of its proper divisors (205015).

643625 is a wasteful number, since it uses less digits than its factorization.

643625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 295 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 643625 is about 802.2624258932. The cubic root of 643625 is about 86.3397860776.

The spelling of 643625 in words is "six hundred forty-three thousand, six hundred twenty-five".