638080558 has 4 divisors (see below), whose sum is σ = 957120840. Its totient is φ = 319040278.

The previous prime is 638080543. The next prime is 638080589. The reversal of 638080558 is 855080836.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×638080558³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159520138 + ... + 159520141.

It is an arithmetic number, because the mean of its divisors is an integer number (239280210).

Almost surely, 2^638080558 is an apocalyptic number.

638080558 is a deficient number, since it is larger than the sum of its proper divisors (319040282).

638080558 is a wasteful number, since it uses less digits than its factorization.

638080558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319040281.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 638080558 is about 25260.2564911760. The cubic root of 638080558 is about 860.9114898788.

The spelling of 638080558 in words is "six hundred thirty-eight million, eighty thousand, five hundred fifty-eight".