638428582 has 8 divisors (see below), whose sum is σ = 1044701352. Its totient is φ = 290194800.

The previous prime is 638428577. The next prime is 638428603. The reversal of 638428582 is 285824836.

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

It is a super-3 number, since 3×638428582³ (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 in 3 ways as a sum of consecutive naturals, for example, 14509719 + ... + 14509762.

It is an arithmetic number, because the mean of its divisors is an integer number (130587669).

Almost surely, 2^638428582 is an apocalyptic number.

638428582 is a deficient number, since it is larger than the sum of its proper divisors (406272770).

638428582 is a wasteful number, since it uses less digits than its factorization.

638428582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29019494.

The product of its digits is 737280, while the sum is 46.

The square root of 638428582 is about 25267.1443182644. The cubic root of 638428582 is about 861.0679818245.

The spelling of 638428582 in words is "six hundred thirty-eight million, four hundred twenty-eight thousand, five hundred eighty-two".