66712086 has 80 divisors (see below), whose sum is σ = 173020320. Its totient is φ = 18817920.

The previous prime is 66712027. The next prime is 66712091. The reversal of 66712086 is 68021766.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66712086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 100596 + ... + 101256.

It is an arithmetic number, because the mean of its divisors is an integer number (2162754).

Almost surely, 2^66712086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66712086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86510160).

66712086 is an abundant number, since it is smaller than the sum of its proper divisors (106308234).

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

66712086 is a wasteful number, since it uses less digits than its factorization.

66712086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 66712086 is about 8167.7466904894. The cubic root of 66712086 is about 405.5721953210.

The spelling of 66712086 in words is "sixty-six million, seven hundred twelve thousand, eighty-six".