639053487 has 24 divisors (see below), whose sum is σ = 946030800. Its totient is φ = 415473408.

The previous prime is 639053423. The next prime is 639053491. The reversal of 639053487 is 784350936.

639053487 is a `hidden beast` number, since 6 + 39 + 0 + 534 + 87 = 666.

It is not a de Polignac number, because 639053487 - 2⁶ = 639053423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639053417) 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, 428439 + ... + 429927.

It is an arithmetic number, because the mean of its divisors is an integer number (39417950).

Almost surely, 2^639053487 is an apocalyptic number.

639053487 is a deficient number, since it is larger than the sum of its proper divisors (306977313).

639053487 is a wasteful number, since it uses less digits than its factorization.

639053487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647 (or 2644 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 639053487 is about 25279.5072539003. The cubic root of 639053487 is about 861.3488329827.

The spelling of 639053487 in words is "six hundred thirty-nine million, fifty-three thousand, four hundred eighty-seven".