638286285 has 64 divisors (see below), whose sum is σ = 1323141120. Its totient is φ = 255156480.

The previous prime is 638286269. The next prime is 638286293. The reversal of 638286285 is 582682836.

It is not a de Polignac number, because 638286285 - 2⁴ = 638286269 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 63 ways as a sum of consecutive naturals, for example, 13630 + ... + 38240.

It is an arithmetic number, because the mean of its divisors is an integer number (20674080).

Almost surely, 2^638286285 is an apocalyptic number.

638286285 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

638286285 is an abundant number, since it is smaller than the sum of its proper divisors (684854835).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638286285 is a wasteful number, since it uses less digits than its factorization.

638286285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24658.

The product of its digits is 1105920, while the sum is 48.

The square root of 638286285 is about 25264.3283108813. The cubic root of 638286285 is about 861.0040036451.

The spelling of 638286285 in words is "six hundred thirty-eight million, two hundred eighty-six thousand, two hundred eighty-five".