71239578205 has 8 divisors (see below), whose sum is σ = 87100465752. Its totient is φ = 55916347968.

The previous prime is 71239578199. The next prime is 71239578233. The reversal of 71239578205 is 50287593217.

It can be written as a sum of positive squares in 4 ways, for example, as 13857292089 + 57382286116 = 117717^2 + 239546^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 71239578205 - 2³ = 71239578197 is a prime.

It is a super-2 number, since 2×71239578205² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134414034 + ... + 134414563.

It is an arithmetic number, because the mean of its divisors is an integer number (10887558219).

Almost surely, 2^71239578205 is an apocalyptic number.

It is an amenable number.

71239578205 is a deficient number, since it is larger than the sum of its proper divisors (15860887547).

71239578205 is a wasteful number, since it uses less digits than its factorization.

71239578205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268828655.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 71239578205 in words is "seventy-one billion, two hundred thirty-nine million, five hundred seventy-eight thousand, two hundred five".