638025580 has 12 divisors (see below), whose sum is σ = 1339853760. Its totient is φ = 255210224.

The previous prime is 638025533. The next prime is 638025593. The reversal of 638025580 is 85520836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15950620 + ... + 15950659.

It is an arithmetic number, because the mean of its divisors is an integer number (111654480).

Almost surely, 2^638025580 is an apocalyptic number.

It is an amenable number.

638025580 is an abundant number, since it is smaller than the sum of its proper divisors (701828180).

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

638025580 is a wasteful number, since it uses less digits than its factorization.

638025580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31901288 (or 31901286 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 638025580 is about 25259.1682365038. The cubic root of 638025580 is about 860.8867633503.

The spelling of 638025580 in words is "six hundred thirty-eight million, twenty-five thousand, five hundred eighty".