871012638 has 12 divisors (see below), whose sum is σ = 1887194088. Its totient is φ = 290337540.

The previous prime is 871012631. The next prime is 871012657. The reversal of 871012638 is 836210178.

871012638 is a `hidden beast` number, since 8 + 7 + 1 + 0 + 12 + 638 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871012631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24194778 + ... + 24194813.

It is an arithmetic number, because the mean of its divisors is an integer number (157266174).

Almost surely, 2^871012638 is an apocalyptic number.

871012638 is an abundant number, since it is smaller than the sum of its proper divisors (1016181450).

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

871012638 is a wasteful number, since it uses less digits than its factorization.

871012638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48389599 (or 48389596 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 871012638 is about 29512.9232371177. The cubic root of 871012638 is about 955.0105123885.

The spelling of 871012638 in words is "eight hundred seventy-one million, twelve thousand, six hundred thirty-eight".