71671587678 has 48 divisors (see below), whose sum is σ = 162324429696. Its totient is φ = 22811714640.

The previous prime is 71671587643. The next prime is 71671587679. The reversal of 71671587678 is 87678517617.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71671587679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84801 + ... + 387987.

It is an arithmetic number, because the mean of its divisors is an integer number (3381758952).

Almost surely, 2^71671587678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71671587678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81162214848).

71671587678 is an abundant number, since it is smaller than the sum of its proper divisors (90652842018).

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

71671587678 is a wasteful number, since it uses less digits than its factorization.

71671587678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303789 (or 303786 counting only the distinct ones).

The product of its digits is 27659520, while the sum is 63.

The spelling of 71671587678 in words is "seventy-one billion, six hundred seventy-one million, five hundred eighty-seven thousand, six hundred seventy-eight".