640389483 has 40 divisors (see below), whose sum is σ = 1002786048. Its totient is φ = 406500336.

The previous prime is 640389479. The next prime is 640389511. The reversal of 640389483 is 384983046.

640389483 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 640389483 - 2² = 640389479 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640389383) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 489316 + ... + 490622.

Almost surely, 2^640389483 is an apocalyptic number.

640389483 is a deficient number, since it is larger than the sum of its proper divisors (362396565).

640389483 is a wasteful number, since it uses less digits than its factorization.

640389483 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605 (or 1596 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 640389483 is about 25305.9179442280. The cubic root of 640389483 is about 861.9486563304.

The spelling of 640389483 in words is "six hundred forty million, three hundred eighty-nine thousand, four hundred eighty-three".