71685486 has 44 divisors (see below), whose sum is σ = 161557152. Its totient is φ = 23855796.

The previous prime is 71685443. The next prime is 71685487. The reversal of 71685486 is 68458617.

It is a happy number.

71685486 is a `hidden beast` number, since 7 + 168 + 5 + 486 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71685487) by changing a digit.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 117795 + ... + 118401.

Almost surely, 2^71685486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71685486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80778576).

71685486 is an abundant number, since it is smaller than the sum of its proper divisors (89871666).

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

71685486 is an frugal number, since it uses more digits than its factorization.

71685486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 612 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 71685486 is about 8466.7281756296. The cubic root of 71685486 is about 415.4101253564.

The spelling of 71685486 in words is "seventy-one million, six hundred eighty-five thousand, four hundred eighty-six".