71638385238 has 384 divisors, whose sum is σ = 194500051200. Its totient is φ = 19020718080.

The previous prime is 71638385227. The next prime is 71638385309. The reversal of 71638385238 is 83258383617.

71638385238 is an astonishing number since 71638385238 = 71638 + ... + 385238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 738540006 + ... + 738540102.

It is an arithmetic number, because the mean of its divisors is an integer number (506510550).

Almost surely, 2^71638385238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71638385238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97250025600).

71638385238 is an abundant number, since it is smaller than the sum of its proper divisors (122861665962).

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

71638385238 is a wasteful number, since it uses less digits than its factorization.

71638385238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 260 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 71638385238 in words is "seventy-one billion, six hundred thirty-eight million, three hundred eighty-five thousand, two hundred thirty-eight".