868188638 has 8 divisors (see below), whose sum is σ = 1302894288. Its totient is φ = 433890544.

The previous prime is 868188577. The next prime is 868188719. The reversal of 868188638 is 836881868.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×868188638² = 1507503022304590088, which 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 3 ways as a sum of consecutive naturals, for example, 96506 + ... + 105117.

It is an arithmetic number, because the mean of its divisors is an integer number (162861786).

Almost surely, 2^868188638 is an apocalyptic number.

868188638 is a deficient number, since it is larger than the sum of its proper divisors (434705650).

868188638 is a wasteful number, since it uses less digits than its factorization.

868188638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203778.

The product of its digits is 3538944, while the sum is 56.

The square root of 868188638 is about 29465.0409468577. The cubic root of 868188638 is about 953.9772822083.

The spelling of 868188638 in words is "eight hundred sixty-eight million, one hundred eighty-eight thousand, six hundred thirty-eight".