66868736 has 80 divisors (see below), whose sum is σ = 150847488. Its totient is φ = 29337600.

The previous prime is 66868717. The next prime is 66868757. The reversal of 66868736 is 63786866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174401 + ... + 174783.

Almost surely, 2^66868736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66868736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75423744).

66868736 is an abundant number, since it is smaller than the sum of its proper divisors (83978752).

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

66868736 is a wasteful number, since it uses less digits than its factorization.

66868736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 427 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 50.

The square root of 66868736 is about 8177.3306157939. The cubic root of 66868736 is about 405.8893953204.

The spelling of 66868736 in words is "sixty-six million, eight hundred sixty-eight thousand, seven hundred thirty-six".