639531060 has 48 divisors (see below), whose sum is σ = 2046500736. Its totient is φ = 146178432.

The previous prime is 639531049. The next prime is 639531073. The reversal of 639531060 is 60135936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760927 + ... + 761766.

It is an arithmetic number, because the mean of its divisors is an integer number (42635432).

Almost surely, 2^639531060 is an apocalyptic number.

639531060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

639531060 is an abundant number, since it is smaller than the sum of its proper divisors (1406969676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639531060 is a wasteful number, since it uses less digits than its factorization.

639531060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522712 (or 1522710 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 639531060 is about 25288.9513424341. The cubic root of 639531060 is about 861.5633452920.

Adding to 639531060 its reverse (60135936), we get a palindrome (699666996).

The spelling of 639531060 in words is "six hundred thirty-nine million, five hundred thirty-one thousand, sixty".