639587542 has 64 divisors (see below), whose sum is σ = 1123766784. Its totient is φ = 270167040.

The previous prime is 639587537. The next prime is 639587603. The reversal of 639587542 is 245785936.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4073728 + ... + 4073884.

It is an arithmetic number, because the mean of its divisors is an integer number (17558856).

Almost surely, 2^639587542 is an apocalyptic number.

639587542 is a deficient number, since it is larger than the sum of its proper divisors (484179242).

639587542 is a wasteful number, since it uses less digits than its factorization.

639587542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its digits is 1814400, while the sum is 49.

The square root of 639587542 is about 25290.0680505213. The cubic root of 639587542 is about 861.5887083491.

The spelling of 639587542 in words is "six hundred thirty-nine million, five hundred eighty-seven thousand, five hundred forty-two".