639147487 has 24 divisors (see below), whose sum is σ = 747999360. Its totient is φ = 541464960.

The previous prime is 639147469. The next prime is 639147499. The reversal of 639147487 is 784741936.

It is not a de Polignac number, because 639147487 - 2¹¹ = 639145439 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 639147487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639141487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 339214 + ... + 341092.

It is an arithmetic number, because the mean of its divisors is an integer number (31166640).

Almost surely, 2^639147487 is an apocalyptic number.

639147487 is a deficient number, since it is larger than the sum of its proper divisors (108851873).

639147487 is a wasteful number, since it uses less digits than its factorization.

639147487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031 (or 2014 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 49.

The square root of 639147487 is about 25281.3663989904. The cubic root of 639147487 is about 861.3910635744.

The spelling of 639147487 in words is "six hundred thirty-nine million, one hundred forty-seven thousand, four hundred eighty-seven".