638783285 has 16 divisors (see below), whose sum is σ = 876787200. Its totient is φ = 437652096.

The previous prime is 638783269. The next prime is 638783291. The reversal of 638783285 is 582387836.

It is not a de Polignac number, because 638783285 - 2⁴ = 638783269 is a prime.

It is a Curzon number.

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, 38036 + ... + 52194.

It is an arithmetic number, because the mean of its divisors is an integer number (54799200).

Almost surely, 2^638783285 is an apocalyptic number.

It is an amenable number.

638783285 is a deficient number, since it is larger than the sum of its proper divisors (238003915).

638783285 is a wasteful number, since it uses less digits than its factorization.

638783285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15460.

The product of its digits is 1935360, while the sum is 50.

The square root of 638783285 is about 25274.1623995732. The cubic root of 638783285 is about 861.2274185306.

The spelling of 638783285 in words is "six hundred thirty-eight million, seven hundred eighty-three thousand, two hundred eighty-five".