71285886 has 96 divisors (see below), whose sum is σ = 190836000. Its totient is φ = 19643904.

The previous prime is 71285869. The next prime is 71285899. The reversal of 71285886 is 68858217.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76270 + ... + 77198.

It is an arithmetic number, because the mean of its divisors is an integer number (1987875).

Almost surely, 2^71285886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71285886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95418000).

71285886 is an abundant number, since it is smaller than the sum of its proper divisors (119550114).

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

71285886 is a wasteful number, since it uses less digits than its factorization.

71285886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983 (or 970 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 71285886 is about 8443.0969436576. The cubic root of 71285886 is about 414.6368061552.

The spelling of 71285886 in words is "seventy-one million, two hundred eighty-five thousand, eight hundred eighty-six".