638103312 has 160 divisors (see below), whose sum is σ = 2283663360. Its totient is φ = 165732480.

The previous prime is 638103307. The next prime is 638103379. The reversal of 638103312 is 213301836.

It is a happy number.

638103312 is a `hidden beast` number, since 638 + 10 + 3 + 3 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23673 + ... + 42855.

It is an arithmetic number, because the mean of its divisors is an integer number (14272896).

Almost surely, 2^638103312 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 638103312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141831680).

638103312 is an abundant number, since it is smaller than the sum of its proper divisors (1645560048).

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

638103312 is a wasteful number, since it uses less digits than its factorization.

638103312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19218 (or 19206 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 638103312 is about 25260.7068784704. The cubic root of 638103312 is about 860.9217231464.

The spelling of 638103312 in words is "six hundred thirty-eight million, one hundred three thousand, three hundred twelve".