638027720 has 32 divisors (see below), whose sum is σ = 1566069120. Its totient is φ = 232009920.

The previous prime is 638027713. The next prime is 638027749. The reversal of 638027720 is 27720836.

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 7 ways as a sum of consecutive naturals, for example, 724592 + ... + 725471.

It is an arithmetic number, because the mean of its divisors is an integer number (48939660).

Almost surely, 2^638027720 is an apocalyptic number.

It is an amenable number.

638027720 is an abundant number, since it is smaller than the sum of its proper divisors (928041400).

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

638027720 is a wasteful number, since it uses less digits than its factorization.

638027720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450085 (or 1450081 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 638027720 is about 25259.2105973247. The cubic root of 638027720 is about 860.8877258486.

The spelling of 638027720 in words is "six hundred thirty-eight million, twenty-seven thousand, seven hundred twenty".