643625626 has 32 divisors (see below), whose sum is σ = 1140386688. Its totient is φ = 266703360.

The previous prime is 643625621. The next prime is 643625657. The reversal of 643625626 is 626526346.

It is not an unprimeable number, because it can be changed into a prime (643625621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59901 + ... + 69823.

It is an arithmetic number, because the mean of its divisors is an integer number (35637084).

Almost surely, 2^643625626 is an apocalyptic number.

643625626 is a deficient number, since it is larger than the sum of its proper divisors (496761062).

643625626 is a wasteful number, since it uses less digits than its factorization.

643625626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10086.

The product of its digits is 311040, while the sum is 40.

The square root of 643625626 is about 25369.7778074622. Note that the first 3 decimals coincide. The cubic root of 643625626 is about 863.3981406937.

The spelling of 643625626 in words is "six hundred forty-three million, six hundred twenty-five thousand, six hundred twenty-six".