643476263 has 8 divisors (see below), whose sum is σ = 661562160. Its totient is φ = 625504320.

The previous prime is 643476199. The next prime is 643476277. The reversal of 643476263 is 362674346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643476263 - 2⁶ = 643476199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643476263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643476293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16973 + ... + 39686.

It is an arithmetic number, because the mean of its divisors is an integer number (82695270).

Almost surely, 2^643476263 is an apocalyptic number.

643476263 is a deficient number, since it is larger than the sum of its proper divisors (18085897).

643476263 is a wasteful number, since it uses less digits than its factorization.

643476263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56977.

The product of its digits is 435456, while the sum is 41.

The square root of 643476263 is about 25366.8339175389. The cubic root of 643476263 is about 863.3313473549.

The spelling of 643476263 in words is "six hundred forty-three million, four hundred seventy-six thousand, two hundred sixty-three".