71387807538 has 32 divisors (see below), whose sum is σ = 144820472832. Its totient is φ = 23455283600.

The previous prime is 71387807503. The next prime is 71387807539. The reversal of 71387807538 is 83570878317.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71387807539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2057845 + ... + 2092247.

It is an arithmetic number, because the mean of its divisors is an integer number (4525639776).

Almost surely, 2^71387807538 is an apocalyptic number.

71387807538 is an abundant number, since it is smaller than the sum of its proper divisors (73432665294).

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

71387807538 is a wasteful number, since it uses less digits than its factorization.

71387807538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39350.

The product of its (nonzero) digits is 7902720, while the sum is 57.

The spelling of 71387807538 in words is "seventy-one billion, three hundred eighty-seven million, eight hundred seven thousand, five hundred thirty-eight".