640844483 has 8 divisors (see below), whose sum is σ = 688926720. Its totient is φ = 594197640.

The previous prime is 640844471. The next prime is 640844549. The reversal of 640844483 is 384448046.

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

It is not a de Polignac number, because 640844483 - 2¹⁰ = 640843459 is a prime.

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 640844483.

It is not an unprimeable number, because it can be changed into a prime (640846483) 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, 357923 + ... + 359708.

It is an arithmetic number, because the mean of its divisors is an integer number (86115840).

Almost surely, 2^640844483 is an apocalyptic number.

640844483 is a deficient number, since it is larger than the sum of its proper divisors (48082237).

640844483 is a wasteful number, since it uses less digits than its factorization.

640844483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717697.

The product of its (nonzero) digits is 294912, while the sum is 41.

The square root of 640844483 is about 25314.9063399413. The cubic root of 640844483 is about 862.1527476436.

The spelling of 640844483 in words is "six hundred forty million, eight hundred forty-four thousand, four hundred eighty-three".