638946871950 has 48 divisors (see below), whose sum is σ = 1586681771760. Its totient is φ = 170160721920.

The previous prime is 638946871933. The next prime is 638946871957. The reversal of 638946871950 is 59178649836.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638946871957) 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, 2699955 + ... + 2927054.

It is an arithmetic number, because the mean of its divisors is an integer number (33055870245).

Almost surely, 2^638946871950 is an apocalyptic number.

638946871950 is an abundant number, since it is smaller than the sum of its proper divisors (947734899810).

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

638946871950 is a wasteful number, since it uses less digits than its factorization.

638946871950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5627781 (or 5627776 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 66.

The spelling of 638946871950 in words is "six hundred thirty-eight billion, nine hundred forty-six million, eight hundred seventy-one thousand, nine hundred fifty".