638950000 has 120 divisors (see below), whose sum is σ = 1668080736. Its totient is φ = 235680000.

The previous prime is 638949977. The next prime is 638950061. The reversal of 638950000 is 59836.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649509 + ... + 650491.

Almost surely, 2^638950000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638950000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834040368).

638950000 is an abundant number, since it is smaller than the sum of its proper divisors (1029130736).

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

638950000 is an equidigital number, since it uses as much as digits as its factorization.

638950000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 638950000 is about 25277.4603154668. The cubic root of 638950000 is about 861.3023354565.

The spelling of 638950000 in words is "six hundred thirty-eight million, nine hundred fifty thousand".