638260135 has 4 divisors (see below), whose sum is σ = 765912168. Its totient is φ = 510608104.

The previous prime is 638260127. The next prime is 638260153. The reversal of 638260135 is 531062836.

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

It is a cyclic number.

It is not a de Polignac number, because 638260135 - 2³ = 638260127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638260135.

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, 63826009 + ... + 63826018.

It is an arithmetic number, because the mean of its divisors is an integer number (191478042).

Almost surely, 2^638260135 is an apocalyptic number.

638260135 is a deficient number, since it is larger than the sum of its proper divisors (127652033).

638260135 is a wasteful number, since it uses less digits than its factorization.

638260135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127652032.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 638260135 is about 25263.8107774738. The cubic root of 638260135 is about 860.9922453047.

The spelling of 638260135 in words is "six hundred thirty-eight million, two hundred sixty thousand, one hundred thirty-five".