638580716 has 6 divisors (see below), whose sum is σ = 1117516260. Its totient is φ = 319290356.

The previous prime is 638580697. The next prime is 638580769. The reversal of 638580716 is 617085836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79822586 + ... + 79822593.

It is an arithmetic number, because the mean of its divisors is an integer number (186252710).

Almost surely, 2^638580716 is an apocalyptic number.

It is an amenable number.

638580716 is a deficient number, since it is larger than the sum of its proper divisors (478935544).

638580716 is a wasteful number, since it uses less digits than its factorization.

638580716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159645183 (or 159645181 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 638580716 is about 25270.1546493091. The cubic root of 638580716 is about 861.1363723049.

The spelling of 638580716 in words is "six hundred thirty-eight million, five hundred eighty thousand, seven hundred sixteen".