643670675 has 24 divisors (see below), whose sum is σ = 813822912. Its totient is φ = 504900000.

The previous prime is 643670669. The next prime is 643670761. The reversal of 643670675 is 576076346.

643670675 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643670675 - 2¹² = 643666579 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 419660 + ... + 421190.

It is an arithmetic number, because the mean of its divisors is an integer number (33909288).

Almost surely, 2^643670675 is an apocalyptic number.

643670675 is a deficient number, since it is larger than the sum of its proper divisors (170152237).

643670675 is a wasteful number, since it uses less digits than its factorization.

643670675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859 (or 1854 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 44.

The square root of 643670675 is about 25370.6656396713. The cubic root of 643670675 is about 863.4182840368.

The spelling of 643670675 in words is "six hundred forty-three million, six hundred seventy thousand, six hundred seventy-five".