638916522 has 8 divisors (see below), whose sum is σ = 1277833056. Its totient is φ = 212972172.

The previous prime is 638916461. The next prime is 638916527. The reversal of 638916522 is 225619836.

It is a sphenic number, since it is the product of 3 distinct primes.

638916522 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (638916527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53243038 + ... + 53243049.

It is an arithmetic number, because the mean of its divisors is an integer number (159729132).

Almost surely, 2^638916522 is an apocalyptic number.

638916522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638916522 is a wasteful number, since it uses less digits than its factorization.

638916522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106486092.

The product of its digits is 155520, while the sum is 42.

The square root of 638916522 is about 25276.7980962779. The cubic root of 638916522 is about 861.2872924520.

The spelling of 638916522 in words is "six hundred thirty-eight million, nine hundred sixteen thousand, five hundred twenty-two".