639948012 has 24 divisors (see below), whose sum is σ = 1628958912. Its totient is φ = 193923600.

The previous prime is 639947989. The next prime is 639948013. The reversal of 639948012 is 210849936.

It is not an unprimeable number, because it can be changed into a prime (639948013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2423914 + ... + 2424177.

It is an arithmetic number, because the mean of its divisors is an integer number (67873288).

Almost surely, 2^639948012 is an apocalyptic number.

It is an amenable number.

639948012 is an abundant number, since it is smaller than the sum of its proper divisors (989010900).

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

639948012 is a wasteful number, since it uses less digits than its factorization.

639948012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4848109 (or 4848107 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 639948012 is about 25297.1937574111. The cubic root of 639948012 is about 861.7505410578.

The spelling of 639948012 in words is "six hundred thirty-nine million, nine hundred forty-eight thousand, twelve".