639428282541 has 32 divisors (see below), whose sum is σ = 949032940800. Its totient is φ = 425506685760.

The previous prime is 639428282539. The next prime is 639428282551. The reversal of 639428282541 is 145282824936.

639428282541 is a `hidden beast` number, since 6 + 3 + 94 + 2 + 8 + 2 + 8 + 2 + 541 = 666.

It is not a de Polignac number, because 639428282541 - 2¹ = 639428282539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639428282531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82598931 + ... + 82606671.

It is an arithmetic number, because the mean of its divisors is an integer number (29657279400).

Almost surely, 2^639428282541 is an apocalyptic number.

It is an amenable number.

639428282541 is a deficient number, since it is larger than the sum of its proper divisors (309604658259).

639428282541 is a wasteful number, since it uses less digits than its factorization.

639428282541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12946 (or 12940 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The spelling of 639428282541 in words is "six hundred thirty-nine billion, four hundred twenty-eight million, two hundred eighty-two thousand, five hundred forty-one".