863604478638 has 48 divisors (see below), whose sum is σ = 2041337376000. Its totient is φ = 261686733840.

The previous prime is 863604478613. The next prime is 863604478651. The reversal of 863604478638 is 836874406368.

863604478638 is a `hidden beast` number, since 86 + 3 + 6 + 0 + 447 + 86 + 38 = 666.

It is a super-2 number, since 2×863604478638² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5084043 + ... + 5251161.

It is an arithmetic number, because the mean of its divisors is an integer number (42527862000).

Almost surely, 2^863604478638 is an apocalyptic number.

863604478638 is an abundant number, since it is smaller than the sum of its proper divisors (1177732897362).

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

863604478638 is a wasteful number, since it uses less digits than its factorization.

863604478638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193237 (or 193234 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 63.

The spelling of 863604478638 in words is "eight hundred sixty-three billion, six hundred four million, four hundred seventy-eight thousand, six hundred thirty-eight".