638560135 has 16 divisors (see below), whose sum is σ = 794564640. Its totient is φ = 492069760.

The previous prime is 638560129. The next prime is 638560147. The reversal of 638560135 is 531065836.

It is not a de Polignac number, because 638560135 - 2⁷ = 638560007 is a prime.

It is a super-2 number, since 2×638560135² = 815518092022436450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638560094 and 638560103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59265 + ... + 69205.

It is an arithmetic number, because the mean of its divisors is an integer number (49660290).

Almost surely, 2^638560135 is an apocalyptic number.

638560135 is a deficient number, since it is larger than the sum of its proper divisors (156004505).

638560135 is a wasteful number, since it uses less digits than its factorization.

638560135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10418.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 638560135 is about 25269.7474265177. The cubic root of 638560135 is about 861.1271209356.

The spelling of 638560135 in words is "six hundred thirty-eight million, five hundred sixty thousand, one hundred thirty-five".