643476765 has 32 divisors (see below), whose sum is σ = 1085423616. Its totient is φ = 325039680.

The previous prime is 643476751. The next prime is 643476791. The reversal of 643476765 is 567674346.

It is not a de Polignac number, because 643476765 - 2⁷ = 643476637 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7134 + ... + 36576.

It is an arithmetic number, because the mean of its divisors is an integer number (33919488).

Almost surely, 2^643476765 is an apocalyptic number.

It is an amenable number.

643476765 is a deficient number, since it is larger than the sum of its proper divisors (441946851).

643476765 is a wasteful number, since it uses less digits than its factorization.

643476765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29529.

The product of its digits is 2540160, while the sum is 48.

The square root of 643476765 is about 25366.8438123469. The cubic root of 643476765 is about 863.3315718606.

The spelling of 643476765 in words is "six hundred forty-three million, four hundred seventy-six thousand, seven hundred sixty-five".