643473641 has 8 divisors (see below), whose sum is σ = 649827360. Its totient is φ = 637131712.

The previous prime is 643473527. The next prime is 643473683. The reversal of 643473641 is 146374346.

It is a happy number.

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 643473641 - 2¹⁴ = 643457257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643473595 and 643473604.

It is not an unprimeable number, because it can be changed into a prime (643473241) 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, 140006 + ... + 144528.

It is an arithmetic number, because the mean of its divisors is an integer number (81228420).

Almost surely, 2^643473641 is an apocalyptic number.

It is an amenable number.

643473641 is a deficient number, since it is larger than the sum of its proper divisors (6353719).

643473641 is a wasteful number, since it uses less digits than its factorization.

643473641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895.

The product of its digits is 145152, while the sum is 38.

The square root of 643473641 is about 25366.7822358296. The cubic root of 643473641 is about 863.3301747357.

The spelling of 643473641 in words is "six hundred forty-three million, four hundred seventy-three thousand, six hundred forty-one".