71638788106 has 8 divisors (see below), whose sum is σ = 107464542084. Its totient is φ = 35817274080.

The previous prime is 71638788097. The next prime is 71638788121. The reversal of 71638788106 is 60188783617.

It can be written as a sum of positive squares in 2 ways, for example, as 67857645025 + 3781143081 = 260495^2 + 61491^2 .

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

It is a super-2 number, since 2×71638788106² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1017405 + ... + 1085536.

Almost surely, 2^71638788106 is an apocalyptic number.

71638788106 is a deficient number, since it is larger than the sum of its proper divisors (35825753978).

71638788106 is a wasteful number, since it uses less digits than its factorization.

71638788106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119976.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 71638788106 in words is "seventy-one billion, six hundred thirty-eight million, seven hundred eighty-eight thousand, one hundred six".